From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Max. PV and HVM Guests
Date: Sun, 8 Nov 2009 19:45:01 +0800
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Hi,

I have observed that there is a maximum limit to the number of PV or HVM
virtual machines you can start before dom0 hangs or crashes.

For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the 7th
instance. Max I can start is 6 without crashing.

For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start the 4th
instance. Max I can start is 3 without crashing.

I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on Intel
DQ45CB motherboard.

Are the above limits reasonable considering the hardware specifications of
my computer?

I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host operating
system is Fedora 11 Linux x86-64.

-- 
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

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Hi,<br><br>I have observed that there is a maximum limit to the number of P=
V or HVM virtual machines you can start before dom0 hangs or crashes.<br><b=
r>For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the 7t=
h instance. Max I can start is 6 without crashing.<br>
<br>For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start th=
e 4th instance. Max I can start is 3 without crashing.<br><br>I have 6 GB o=
f DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on Intel DQ45CB mothe=
rboard.<br>
<br>Are the above limits reasonable considering the hardware specifications=
 of my computer?<br><br>I am using Xen 3.5-unstable changeset 20143 with pv=
-ops dom0 kernels 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5.=
 My host operating system is Fedora 11 Linux x86-64.<br clear=3D"all">
<br>-- <br>Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mech=
anical Engineering)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) Nat=
ional University of Singapore<br>My Primary Blog: <a href=3D"http://teo-en-=
ming-aka-zhang-enming.blogspot.com">http://teo-en-ming-aka-zhang-enming.blo=
gspot.com</a><br>
My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com">http://enming=
teo.wordpress.com</a><br>My Youtube videos: <a href=3D"http://www.youtube.c=
om/user/enmingteo">http://www.youtube.com/user/enmingteo</a><br>Email: <a h=
ref=3D"mailto:space.time.universe@gmail.com">space.time.universe@gmail.com<=
/a><br>
Mobile Phone (Starhub Prepaid): +65-8369-2618<br>Street: Bedok Reservoir Ro=
ad<br>Country: Singapore<br>

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From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Max. PV and HVM Guests
Date: Sun, 8 Nov 2009 19:46:34 +0800
Message-ID: <f712b9cf0911080346y7e84f9c9o8ddc933920debb01@mail.gmail.com>
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Forgot to mention that each of my linux PV guest has 512 MB memory while
each of my linux HVM guest has 1024 MB memory.

-- 
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Sun, Nov 8, 2009 at 7:45 PM, Mr. Teo En Ming (Zhang Enming) <
space.time.universe@gmail.com> wrote:

> Hi,
>
> I have observed that there is a maximum limit to the number of PV or HVM
> virtual machines you can start before dom0 hangs or crashes.
>
> For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the 7th
> instance. Max I can start is 6 without crashing.
>
> For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start the
> 4th instance. Max I can start is 3 without crashing.
>
> I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on Intel
> DQ45CB motherboard.
>
> Are the above limits reasonable considering the hardware specifications of
> my computer?
>
> I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
> 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host operating
> system is Fedora 11 Linux x86-64.
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>

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<br>Forgot to mention that each of my linux PV guest has 512 MB memory whil=
e each of my linux HVM guest has 1024 MB memory.<br><br>-- <br>Mr. Teo En M=
ing (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)<br>
Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University of Sin=
gapore<br>My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.b=
logspot.com">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Sec=
ondary Blog: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wo=
rdpress.com</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Sun, Nov 8, 2009 at 7:45 PM, Mr. Teo En Ming (Zhang Enming) <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:space.time.universe@gmail.com">space.=
time.universe@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br><br>I have=
 observed that there is a maximum limit to the number of PV or HVM virtual =
machines you can start before dom0 hangs or crashes.<br>
<br>For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the =
7th instance. Max I can start is 6 without crashing.<br>
<br>For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start th=
e 4th instance. Max I can start is 3 without crashing.<br><br>I have 6 GB o=
f DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on Intel DQ45CB mothe=
rboard.<br>

<br>Are the above limits reasonable considering the hardware specifications=
 of my computer?<br><br>I am using Xen 3.5-unstable changeset 20143 with pv=
-ops dom0 kernels 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5.=
 My host operating system is Fedora 11 Linux x86-64.<br clear=3D"all">

<br>-- <br>Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mech=
anical Engineering)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) Nat=
ional University of Singapore<br>My Primary Blog: <a href=3D"http://teo-en-=
ming-aka-zhang-enming.blogspot.com" target=3D"_blank">http://teo-en-ming-ak=
a-zhang-enming.blogspot.com</a><br>

My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com" target=3D"_bl=
ank">http://enmingteo.wordpress.com</a><br>My Youtube videos: <a href=3D"ht=
tp://www.youtube.com/user/enmingteo" target=3D"_blank">http://www.youtube.c=
om/user/enmingteo</a><br>
Email: <a href=3D"mailto:space.time.universe@gmail.com" target=3D"_blank">s=
pace.time.universe@gmail.com</a><br>
Mobile Phone (Starhub Prepaid): +65-8369-2618<br>Street: Bedok Reservoir Ro=
ad<br>Country: Singapore<br>
</blockquote></div><br><br clear=3D"all"><br><br>

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From mboxrd@z Thu Jan  1 00:00:00 1970
From: Moi meme <storm66@club-internet.fr>
Subject: Re: Max. PV and HVM Guests
Date: Sun, 08 Nov 2009 14:01:42 +0100
Message-ID: <1257685302.5339.11.camel@k2000.jpp.fr>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
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List-Id: xen-devel@lists.xenproject.org

Hello,

The maximum is a direct function of the available memory, every new
machine "eats" some memory and when there is no more memory ......
I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,
2003 server, 2000 Server,Fedora, Debian all in 32bits.
In my own system I have tested with upto 10 VMs of 512M each without
breaking the system.

Regards

JP Pozzi

Le dimanche 08 novembre 2009 =C3=A0 19:45 +0800, Mr. Teo En Ming (Zhang
Enming) a =C3=A9crit :
> Hi,
>=20
> I have observed that there is a maximum limit to the number of PV or
> HVM virtual machines you can start before dom0 hangs or crashes.
>=20
> For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the
> 7th instance. Max I can start is 6 without crashing.
>=20
> For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start
> the 4th instance. Max I can start is 3 without crashing.
>=20
> I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
> Intel DQ45CB motherboard.
>=20
> Are the above limits reasonable considering the hardware
> specifications of my computer?
>=20
> I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
> 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
> operating system is Fedora 11 Linux x86-64.
>=20
> --=20
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Subject: Re: Max. PV and HVM Guests
Date: Sun, 8 Nov 2009 15:50:31 +0200
Message-ID: <20091108135031.GI1434@reaktio.net>
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List-Id: xen-devel@lists.xenproject.org

On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    Hi,
> 
>    I have observed that there is a maximum limit to the number of PV or HVM
>    virtual machines you can start before dom0 hangs or crashes.
> 
>    For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the 7th
>    instance. Max I can start is 6 without crashing.
> 
>    For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start the
>    4th instance. Max I can start is 3 without crashing.
> 
>    I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
>    Intel DQ45CB motherboard.
> 
>    Are the above limits reasonable considering the hardware specifications of
>    my computer?
> 
>    I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
>    2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
>    operating system is Fedora 11 Linux x86-64.
> 

Dom0 or Xen shouldn't crash for starting guests.
Sounds like a bug somewhere.

Any errors/tracebacks? Do you have serial console configured? 

-- Pasi

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grant McWilliams <grantmasterflash@gmail.com>
Subject: Re: [Xen-devel] Max. PV and HVM Guests
Date: Sun, 8 Nov 2009 08:30:07 -0800
Message-ID: <ed123fa30911080830w605a0f98jfa37c843631cacb4@mail.gmail.com>
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On Sun, Nov 8, 2009 at 5:50 AM, Pasi K=C3=A4rkk=C3=A4inen <pasik@iki.fi> wr=
ote:

> On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> >    Hi,
> >
> >    I have observed that there is a maximum limit to the number of PV or
> HVM
> >    virtual machines you can start before dom0 hangs or crashes.
> >
>

Mr. Teo En Ming,
   I have a CentOS 5.3 x86_64 machine with 16GB of ram currently running 41
PV DomUs. Each DomU has 300 MB of ram.  I have to admit weird things do
happen if I decide to start them all at the same time but the machine never
crashes.

Grant

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<br><br><div class=3D"gmail_quote">On Sun, Nov 8, 2009 at 5:50 AM, Pasi K=
=C3=A4rkk=C3=A4inen <span dir=3D"ltr">&lt;<a href=3D"mailto:pasik@iki.fi">p=
asik@iki.fi</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; =
padding-left: 1ex;">

<div class=3D"im">On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming=
 (Zhang Enming) wrote:<br>
&gt; =C2=A0 =C2=A0Hi,<br>
&gt;<br>
&gt; =C2=A0 =C2=A0I have observed that there is a maximum limit to the numb=
er of PV or HVM<br>
&gt; =C2=A0 =C2=A0virtual machines you can start before dom0 hangs or crash=
es.<br>
&gt;</div></blockquote></div><br>Mr. Teo En Ming,<br>=C2=A0=C2=A0 I have a =
CentOS 5.3 x86_64 machine with 16GB of ram currently running 41 PV DomUs. E=
ach DomU has 300 MB of ram.=C2=A0 I have to admit weird things do happen if=
 I decide to start them all at the same time but the machine never crashes.=
<br>

<br>Grant<br>

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--===============0320178091==--

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: [Xen-devel] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 11:35:02 +0800
Message-ID: <f712b9cf0911081935j1fce48d4v3775950b01571431@mail.gmail.com>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
	<20091108135031.GI1434@reaktio.net>
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Yes. I will try to see if there's a traceback.

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Sun, Nov 8, 2009 at 9:50 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:

> On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> >    Hi,
> >
> >    I have observed that there is a maximum limit to the number of PV or
> HVM
> >    virtual machines you can start before dom0 hangs or crashes.
> >
> >    For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start t=
he
> 7th
> >    instance. Max I can start is 6 without crashing.
> >
> >    For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start
> the
> >    4th instance. Max I can start is 3 without crashing.
> >
> >    I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz o=
n
> >    Intel DQ45CB motherboard.
> >
> >    Are the above limits reasonable considering the hardware
> specifications of
> >    my computer?
> >
> >    I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
> >    2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
> >    operating system is Fedora 11 Linux x86-64.
> >
>
> Dom0 or Xen shouldn't crash for starting guests.
> Sounds like a bug somewhere.
>
> Any errors/tracebacks? Do you have serial console configured?
>
> -- Pasi
>
>

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Yes. I will try to see if there&#39;s a traceback.<br><br>-- <br>Mr. Teo En=
 Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)<b=
r>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University of S=
ingapore<br>
My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogspot.co=
m">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Secondary Blo=
g: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wordpress.co=
m</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Sun, Nov 8, 2009 at 9:50 PM, Pasi K=E4rkk=E4inen <span dir=3D"=
ltr">&lt;<a href=3D"mailto:pasik@iki.fi">pasik@iki.fi</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(2=
04, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class=3D"im">On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming=
 (Zhang Enming) wrote:<br>
&gt; =A0 =A0Hi,<br>
&gt;<br>
&gt; =A0 =A0I have observed that there is a maximum limit to the number of =
PV or HVM<br>
&gt; =A0 =A0virtual machines you can start before dom0 hangs or crashes.<br=
>
&gt;<br>
&gt; =A0 =A0For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I st=
art the 7th<br>
&gt; =A0 =A0instance. Max I can start is 6 without crashing.<br>
&gt;<br>
&gt; =A0 =A0For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I =
start the<br>
&gt; =A0 =A04th instance. Max I can start is 3 without crashing.<br>
&gt;<br>
&gt; =A0 =A0I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 =
GHz on<br>
&gt; =A0 =A0Intel DQ45CB motherboard.<br>
&gt;<br>
&gt; =A0 =A0Are the above limits reasonable considering the hardware specif=
ications of<br>
&gt; =A0 =A0my computer?<br>
&gt;<br>
&gt; =A0 =A0I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 ke=
rnels<br>
&gt; =A0 =A02.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My ho=
st<br>
&gt; =A0 =A0operating system is Fedora 11 Linux x86-64.<br>
&gt;<br>
<br>
</div>Dom0 or Xen shouldn&#39;t crash for starting guests.<br>
Sounds like a bug somewhere.<br>
<br>
Any errors/tracebacks? Do you have serial console configured?<br>
<font color=3D"#888888"><br>
-- Pasi<br>
<br>
</font></blockquote></div><br><br clear=3D"all"><br><br>

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_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users
--===============2091577481==--

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Robert Dunkley" <Robert@saq.co.uk>
Subject: RE: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 08:17:31 -0000
Message-ID: <C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT>
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	<1257685302.5339.11.camel@k2000.jpp.fr>
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To: jp.pozzi@izzop.net, "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

There seems to also be a limit imposed by CPU context switching. Ie. =
Once you have enough VMs trying to grab a cpu core things come to a =
standstill as the cpu spends most of its time switching rather than =
processing. The most common bottleneck I find is disk performance but =
this depends hugely on what your VMs are doing.

-----Original Message-----
From: xen-users-bounces@lists.xensource.com =
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Moi meme
Sent: 08 November 2009 13:02
To: Mr. Teo En Ming (Zhang Enming)
Cc: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
Subject: Re: [Xen-users] Max. PV and HVM Guests

Hello,

The maximum is a direct function of the available memory, every new
machine "eats" some memory and when there is no more memory ......
I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,
2003 server, 2000 Server,Fedora, Debian all in 32bits.
In my own system I have tested with upto 10 VMs of 512M each without
breaking the system.

Regards

JP Pozzi

Le dimanche 08 novembre 2009 =C3=A0 19:45 +0800, Mr. Teo En Ming (Zhang
Enming) a =C3=A9crit :
> Hi,
>=20
> I have observed that there is a maximum limit to the number of PV or
> HVM virtual machines you can start before dom0 hangs or crashes.
>=20
> For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the
> 7th instance. Max I can start is 6 without crashing.
>=20
> For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start
> the 4th instance. Max I can start is 3 without crashing.
>=20
> I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
> Intel DQ45CB motherboard.
>=20
> Are the above limits reasonable considering the hardware
> specifications of my computer?
>=20
> I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
> 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
> operating system is Fedora 11 Linux x86-64.
>=20
> --=20
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users




_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

The SAQ Group

Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
Company Number: 06481952

http://www.saqnet.co.uk AS29219

SAQ Group Delivers high quality, honestly priced communication and I.T. =
services to UK Business.

Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit =
: Backups : Managed Networks : Remote Support.

ISPA Member

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 18:52:37 +0800
Message-ID: <f712b9cf0911090252n4e5905a4j76aacd35a5bc786d@mail.gmail.com>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
	<1257685302.5339.11.camel@k2000.jpp.fr>
	<C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT>
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Hi,

Please watch this 4-minute video at
http://www.youtube.com/watch?v=3DLbLaPpwNAx4

I have only started 3 HVM Linux guests with 1 GB ram each. I can't start th=
e
4th HVM guest. If I attempt to start the 4th instance, it will crash dom0.

Are there anything in the xm dmesg output that could explain the low limit
to the number of VMs that I could start before dom0 becomes unresponsive?

Thank you.

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 4:17 PM, Robert Dunkley <Robert@saq.co.uk> wrote:

> There seems to also be a limit imposed by CPU context switching. Ie. Once
> you have enough VMs trying to grab a cpu core things come to a standstill=
 as
> the cpu spends most of its time switching rather than processing. The mos=
t
> common bottleneck I find is disk performance but this depends hugely on w=
hat
> your VMs are doing.
>
> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com [mailto:
> xen-users-bounces@lists.xensource.com] On Behalf Of Moi meme
> Sent: 08 November 2009 13:02
> To: Mr. Teo En Ming (Zhang Enming)
> Cc: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> Subject: Re: [Xen-users] Max. PV and HVM Guests
>
> Hello,
>
> The maximum is a direct function of the available memory, every new
> machine "eats" some memory and when there is no more memory ......
> I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,
> 2003 server, 2000 Server,Fedora, Debian all in 32bits.
> In my own system I have tested with upto 10 VMs of 512M each without
> breaking the system.
>
> Regards
>
> JP Pozzi
>
> Le dimanche 08 novembre 2009 =E0 19:45 +0800, Mr. Teo En Ming (Zhang
> Enming) a =E9crit :
> > Hi,
> >
> > I have observed that there is a maximum limit to the number of PV or
> > HVM virtual machines you can start before dom0 hangs or crashes.
> >
> > For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the
> > 7th instance. Max I can start is 6 without crashing.
> >
> > For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start
> > the 4th instance. Max I can start is 3 without crashing.
> >
> > I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
> > Intel DQ45CB motherboard.
> >
> > Are the above limits reasonable considering the hardware
> > specifications of my computer?
> >
> > I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
> > 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
> > operating system is Fedora 11 Linux x86-64.
> >
> > --
> > Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> > Engineering)
> > Alma Maters:
> > (1) Singapore Polytechnic
> > (2) National University of Singapore
> > My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> > My Secondary Blog: http://enmingteo.wordpress.com
> > My Youtube videos: http://www.youtube.com/user/enmingteo
> > Email: space.time.universe@gmail.com
> > Mobile Phone (Starhub Prepaid): +65-8369-2618
> > Street: Bedok Reservoir Road
> > Country: Singapore
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@lists.xensource.com
> > http://lists.xensource.com/xen-users
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
> The SAQ Group
>
> Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
> SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
> Company Number: 06481952
>
> http://www.saqnet.co.uk AS29219
>
> SAQ Group Delivers high quality, honestly priced communication and I.T.
> services to UK Business.
>
> Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit =
:
> Backups : Managed Networks : Remote Support.
>
> ISPA Member
>
>

--001485f6c360e9a9bf0477edfd51
Content-Type: text/html; charset=ISO-8859-1
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Hi,<br><br>Please watch this 4-minute video at <a href=3D"http://www.youtub=
e.com/watch?v=3DLbLaPpwNAx4">http://www.youtube.com/watch?v=3DLbLaPpwNAx4</=
a><br><br>I have only started 3 HVM Linux guests with 1 GB ram each. I can&=
#39;t start the 4th HVM guest. If I attempt to start the 4th instance, it w=
ill crash dom0.<br>
<br>Are there anything in the xm dmesg output that could explain the low li=
mit to the number of VMs that I could start before dom0 becomes unresponsiv=
e?<br><br>Thank you.<br><br>-- <br>Mr. Teo En Ming (Zhang Enming) Dip(Mecha=
tronics) BEng(Hons)(Mechanical Engineering)<br>
Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University of Sin=
gapore<br>My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.b=
logspot.com">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Sec=
ondary Blog: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wo=
rdpress.com</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Mon, Nov 9, 2009 at 4:17 PM, Robert Dunkley <span dir=3D"ltr">=
&lt;<a href=3D"mailto:Robert@saq.co.uk">Robert@saq.co.uk</a>&gt;</span> wro=
te:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">There seems to al=
so be a limit imposed by CPU context switching. Ie. Once you have enough VM=
s trying to grab a cpu core things come to a standstill as the cpu spends m=
ost of its time switching rather than processing. The most common bottlenec=
k I find is disk performance but this depends hugely on what your VMs are d=
oing.<br>

<div><div></div><div class=3D"h5"><br>
-----Original Message-----<br>
From: <a href=3D"mailto:xen-users-bounces@lists.xensource.com">xen-users-bo=
unces@lists.xensource.com</a> [mailto:<a href=3D"mailto:xen-users-bounces@l=
ists.xensource.com">xen-users-bounces@lists.xensource.com</a>] On Behalf Of=
 Moi meme<br>

Sent: 08 November 2009 13:02<br>
To: Mr. Teo En Ming (Zhang Enming)<br>
Cc: <a href=3D"mailto:xen-devel@lists.xensource.com">xen-devel@lists.xensou=
rce.com</a>; <a href=3D"mailto:xen-users@lists.xensource.com">xen-users@lis=
ts.xensource.com</a><br>
Subject: Re: [Xen-users] Max. PV and HVM Guests<br>
<br>
Hello,<br>
<br>
The maximum is a direct function of the available memory, every new<br>
machine &quot;eats&quot; some memory and when there is no more memory .....=
.<br>
I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,<br>
2003 server, 2000 Server,Fedora, Debian all in 32bits.<br>
In my own system I have tested with upto 10 VMs of 512M each without<br>
breaking the system.<br>
<br>
Regards<br>
<br>
JP Pozzi<br>
<br>
Le dimanche 08 novembre 2009 =E0 19:45 +0800, Mr. Teo En Ming (Zhang<br>
Enming) a =E9crit :<br>
&gt; Hi,<br>
&gt;<br>
&gt; I have observed that there is a maximum limit to the number of PV or<b=
r>
&gt; HVM virtual machines you can start before dom0 hangs or crashes.<br>
&gt;<br>
&gt; For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the=
<br>
&gt; 7th instance. Max I can start is 6 without crashing.<br>
&gt;<br>
&gt; For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start<b=
r>
&gt; the 4th instance. Max I can start is 3 without crashing.<br>
&gt;<br>
&gt; I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on<=
br>
&gt; Intel DQ45CB motherboard.<br>
&gt;<br>
&gt; Are the above limits reasonable considering the hardware<br>
&gt; specifications of my computer?<br>
&gt;<br>
&gt; I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels<b=
r>
&gt; 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host<br>
&gt; operating system is Fedora 11 Linux x86-64.<br>
&gt;<br>
&gt; --<br>
&gt; Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical=
<br>
&gt; Engineering)<br>
&gt; Alma Maters:<br>
&gt; (1) Singapore Polytechnic<br>
&gt; (2) National University of Singapore<br>
&gt; My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogsp=
ot.com" target=3D"_blank">http://teo-en-ming-aka-zhang-enming.blogspot.com<=
/a><br>
&gt; My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com" target=
=3D"_blank">http://enmingteo.wordpress.com</a><br>
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arget=3D"_blank">http://www.youtube.com/user/enmingteo</a><br>
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verse@gmail.com</a><br>
&gt; Mobile Phone (Starhub Prepaid): +65-8369-2618<br>
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p://lists.xensource.com/xen-users</a><br>
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com</a><br>
<a href=3D"http://lists.xensource.com/xen-users" target=3D"_blank">http://l=
ists.xensource.com/xen-users</a><br>
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</div></div>The SAQ Group<br>
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Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ<br>
SAQ is the trading name of SEMTEC Limited. Registered in England &amp; Wale=
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Company Number: 06481952<br>
<br>
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From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 19:53:39 +0800
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Could it be that my Intel Pentium Dual Core E6300 2.8 GHz processor is not
powerful enough? Maybe need to upgrade to Intel Core 2 Quad?

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 6:52 PM, Mr. Teo En Ming (Zhang Enming) <
space.time.universe@gmail.com> wrote:

> Hi,
>
> Please watch this 4-minute video at
> http://www.youtube.com/watch?v=3DLbLaPpwNAx4
>
> I have only started 3 HVM Linux guests with 1 GB ram each. I can't start
> the 4th HVM guest. If I attempt to start the 4th instance, it will crash
> dom0.
>
> Are there anything in the xm dmesg output that could explain the low limi=
t
> to the number of VMs that I could start before dom0 becomes unresponsive?
>
> Thank you.
>
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>
> On Mon, Nov 9, 2009 at 4:17 PM, Robert Dunkley <Robert@saq.co.uk> wrote:
>
>> There seems to also be a limit imposed by CPU context switching. Ie. Onc=
e
>> you have enough VMs trying to grab a cpu core things come to a standstil=
l as
>> the cpu spends most of its time switching rather than processing. The mo=
st
>> common bottleneck I find is disk performance but this depends hugely on =
what
>> your VMs are doing.
>>
>> -----Original Message-----
>> From: xen-users-bounces@lists.xensource.com [mailto:
>> xen-users-bounces@lists.xensource.com] On Behalf Of Moi meme
>> Sent: 08 November 2009 13:02
>> To: Mr. Teo En Ming (Zhang Enming)
>> Cc: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
>> Subject: Re: [Xen-users] Max. PV and HVM Guests
>>
>> Hello,
>>
>> The maximum is a direct function of the available memory, every new
>> machine "eats" some memory and when there is no more memory ......
>> I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,
>> 2003 server, 2000 Server,Fedora, Debian all in 32bits.
>> In my own system I have tested with upto 10 VMs of 512M each without
>> breaking the system.
>>
>> Regards
>>
>> JP Pozzi
>>
>> Le dimanche 08 novembre 2009 =E0 19:45 +0800, Mr. Teo En Ming (Zhang
>> Enming) a =E9crit :
>> > Hi,
>> >
>> > I have observed that there is a maximum limit to the number of PV or
>> > HVM virtual machines you can start before dom0 hangs or crashes.
>> >
>> > For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the
>> > 7th instance. Max I can start is 6 without crashing.
>> >
>> > For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start
>> > the 4th instance. Max I can start is 3 without crashing.
>> >
>> > I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
>> > Intel DQ45CB motherboard.
>> >
>> > Are the above limits reasonable considering the hardware
>> > specifications of my computer?
>> >
>> > I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
>> > 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
>> > operating system is Fedora 11 Linux x86-64.
>> >
>> > --
>> > Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
>> > Engineering)
>> > Alma Maters:
>> > (1) Singapore Polytechnic
>> > (2) National University of Singapore
>> > My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
>> > My Secondary Blog: http://enmingteo.wordpress.com
>> > My Youtube videos: http://www.youtube.com/user/enmingteo
>> > Email: space.time.universe@gmail.com
>> > Mobile Phone (Starhub Prepaid): +65-8369-2618
>> > Street: Bedok Reservoir Road
>> > Country: Singapore
>> > _______________________________________________
>> > Xen-users mailing list
>> > Xen-users@lists.xensource.com
>> > http://lists.xensource.com/xen-users
>>
>>
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
>> The SAQ Group
>>
>> Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
>> SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
>> Company Number: 06481952
>>
>> http://www.saqnet.co.uk AS29219
>>
>> SAQ Group Delivers high quality, honestly priced communication and I.T.
>> services to UK Business.
>>
>> Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit=
 :
>> Backups : Managed Networks : Remote Support.
>>
>> ISPA Member
>>
>>
>
>
>
>

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Could it be that my Intel Pentium Dual Core E6300 2.8 GHz processor is not =
powerful enough? Maybe need to upgrade to Intel Core 2 Quad?<br><br>-- <br>=
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engi=
neering)<br>
Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University of Sin=
gapore<br>My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.b=
logspot.com">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Sec=
ondary Blog: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wo=
rdpress.com</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Mon, Nov 9, 2009 at 6:52 PM, Mr. Teo En Ming (Zhang Enming) <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:space.time.universe@gmail.com">space.=
time.universe@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br><br>Please=
 watch this 4-minute video at <a href=3D"http://www.youtube.com/watch?v=3DL=
bLaPpwNAx4" target=3D"_blank">http://www.youtube.com/watch?v=3DLbLaPpwNAx4<=
/a><br>
<br>I have only started 3 HVM Linux guests with 1 GB ram each. I can&#39;t =
start the 4th HVM guest. If I attempt to start the 4th instance, it will cr=
ash dom0.<br>
<br>Are there anything in the xm dmesg output that could explain the low li=
mit to the number of VMs that I could start before dom0 becomes unresponsiv=
e?<br><br>Thank you.<div class=3D"im"><br><br>-- <br>Mr. Teo En Ming (Zhang=
 Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)<br>

Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University of Sin=
gapore<br>My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.b=
logspot.com" target=3D"_blank">http://teo-en-ming-aka-zhang-enming.blogspot=
.com</a><br>
My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com" target=3D"_bl=
ank">http://enmingteo.wordpress.com</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo" target=
=3D"_blank">http://www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"=
mailto:space.time.universe@gmail.com" target=3D"_blank">space.time.universe=
@gmail.com</a><br>
Mobile Phone (Starhub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br></div><div><div><=
/div><div class=3D"h5"><div class=3D"gmail_quote">On Mon, Nov 9, 2009 at 4:=
17 PM, Robert Dunkley <span dir=3D"ltr">&lt;<a href=3D"mailto:Robert@saq.co=
.uk" target=3D"_blank">Robert@saq.co.uk</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">There seems to al=
so be a limit imposed by CPU context switching. Ie. Once you have enough VM=
s trying to grab a cpu core things come to a standstill as the cpu spends m=
ost of its time switching rather than processing. The most common bottlenec=
k I find is disk performance but this depends hugely on what your VMs are d=
oing.<br>


<div><div></div><div><br>
-----Original Message-----<br>
From: <a href=3D"mailto:xen-users-bounces@lists.xensource.com" target=3D"_b=
lank">xen-users-bounces@lists.xensource.com</a> [mailto:<a href=3D"mailto:x=
en-users-bounces@lists.xensource.com" target=3D"_blank">xen-users-bounces@l=
ists.xensource.com</a>] On Behalf Of Moi meme<br>


Sent: 08 November 2009 13:02<br>
To: Mr. Teo En Ming (Zhang Enming)<br>
Cc: <a href=3D"mailto:xen-devel@lists.xensource.com" target=3D"_blank">xen-=
devel@lists.xensource.com</a>; <a href=3D"mailto:xen-users@lists.xensource.=
com" target=3D"_blank">xen-users@lists.xensource.com</a><br>
Subject: Re: [Xen-users] Max. PV and HVM Guests<br>
<br>
Hello,<br>
<br>
The maximum is a direct function of the available memory, every new<br>
machine &quot;eats&quot; some memory and when there is no more memory .....=
.<br>
I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM,<br>
2003 server, 2000 Server,Fedora, Debian all in 32bits.<br>
In my own system I have tested with upto 10 VMs of 512M each without<br>
breaking the system.<br>
<br>
Regards<br>
<br>
JP Pozzi<br>
<br>
Le dimanche 08 novembre 2009 =E0 19:45 +0800, Mr. Teo En Ming (Zhang<br>
Enming) a =E9crit :<br>
&gt; Hi,<br>
&gt;<br>
&gt; I have observed that there is a maximum limit to the number of PV or<b=
r>
&gt; HVM virtual machines you can start before dom0 hangs or crashes.<br>
&gt;<br>
&gt; For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the=
<br>
&gt; 7th instance. Max I can start is 6 without crashing.<br>
&gt;<br>
&gt; For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start<b=
r>
&gt; the 4th instance. Max I can start is 3 without crashing.<br>
&gt;<br>
&gt; I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on<=
br>
&gt; Intel DQ45CB motherboard.<br>
&gt;<br>
&gt; Are the above limits reasonable considering the hardware<br>
&gt; specifications of my computer?<br>
&gt;<br>
&gt; I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels<b=
r>
&gt; 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host<br>
&gt; operating system is Fedora 11 Linux x86-64.<br>
&gt;<br>
&gt; --<br>
&gt; Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical=
<br>
&gt; Engineering)<br>
&gt; Alma Maters:<br>
&gt; (1) Singapore Polytechnic<br>
&gt; (2) National University of Singapore<br>
&gt; My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogsp=
ot.com" target=3D"_blank">http://teo-en-ming-aka-zhang-enming.blogspot.com<=
/a><br>
&gt; My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com" target=
=3D"_blank">http://enmingteo.wordpress.com</a><br>
&gt; My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo" t=
arget=3D"_blank">http://www.youtube.com/user/enmingteo</a><br>
&gt; Email: <a href=3D"mailto:space.time.universe@gmail.com" target=3D"_bla=
nk">space.time.universe@gmail.com</a><br>
&gt; Mobile Phone (Starhub Prepaid): +65-8369-2618<br>
&gt; Street: Bedok Reservoir Road<br>
&gt; Country: Singapore<br>
&gt; _______________________________________________<br>
&gt; Xen-users mailing list<br>
&gt; <a href=3D"mailto:Xen-users@lists.xensource.com" target=3D"_blank">Xen=
-users@lists.xensource.com</a><br>
&gt; <a href=3D"http://lists.xensource.com/xen-users" target=3D"_blank">htt=
p://lists.xensource.com/xen-users</a><br>
<br>
<br>
<br>
<br>
_______________________________________________<br>
Xen-users mailing list<br>
<a href=3D"mailto:Xen-users@lists.xensource.com" target=3D"_blank">Xen-user=
s@lists.xensource.com</a><br>
<a href=3D"http://lists.xensource.com/xen-users" target=3D"_blank">http://l=
ists.xensource.com/xen-users</a><br>
<br>
</div></div>The SAQ Group<br>
<br>
Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ<br>
SAQ is the trading name of SEMTEC Limited. Registered in England &amp; Wale=
s<br>
Company Number: 06481952<br>
<br>
<a href=3D"http://www.saqnet.co.uk" target=3D"_blank">http://www.saqnet.co.=
uk</a> AS29219<br>
<br>
SAQ Group Delivers high quality, honestly priced communication and I.T. ser=
vices to UK Business.<br>
<br>
Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : =
Backups : Managed Networks : Remote Support.<br>
<br>
ISPA Member<br>
<br>
</blockquote></div><br><br clear=3D"all"><br><br>
</div></div></blockquote></div><br><br clear=3D"all"><br><br>

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From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Subject: Re: [Xen-devel] Re: Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 13:54:58 +0200
Message-ID: <20091109115458.GF16033@reaktio.net>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
	<1257685302.5339.11.camel@k2000.jpp.fr>
	<C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT>
	<f712b9cf0911090252n4e5905a4j76aacd35a5bc786d@mail.gmail.com>
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To: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com, Robert Dunkley <Robert@saq.co.uk>
List-Id: xen-devel@lists.xenproject.org

On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    Hi,
> 
>    Please watch this 4-minute video at
>    [1]http://www.youtube.com/watch?v=LbLaPpwNAx4
> 
>    I have only started 3 HVM Linux guests with 1 GB ram each. I can't start
>    the 4th HVM guest. If I attempt to start the 4th instance, it will crash
>    dom0.
> 
>    Are there anything in the xm dmesg output that could explain the low limit
>    to the number of VMs that I could start before dom0 becomes unresponsive?
> 

Have you limited dom0 memory (by specifying dom0_mem=XMB option in
grub.conf for xen.gz) ?

What does "xm info" say about free memory before starting any guests? 

-- Pasi

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Re: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 20:01:00 +0800
Message-ID: <f712b9cf0911090401o49723f40waf1707e788ef0b20@mail.gmail.com>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
	<1257685302.5339.11.camel@k2000.jpp.fr>
	<C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT>
	<f712b9cf0911090252n4e5905a4j76aacd35a5bc786d@mail.gmail.com>
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No, I didn't limit dom0 memory in grub.conf.

Here's my xm info output after I have shutdown all the virtual machines.

[root@fedora11-x86-64-host ~]# xm list
Name                                        ID   Mem VCPUs      State
Time(s)
Domain-0                                     0  2812     2     r-----
3242.5
[root@fedora11-x86-64-host ~]# xm info
host                   : fedora11-x86-64-host
release                : 2.6.30-rc3-enming.teo-tip
version                : #1 SMP Wed Aug 19 23:14:15 SGT 2009
machine                : x86_64
nr_cpus                : 2
nr_nodes               : 1
cores_per_socket       : 2
threads_per_core       : 1
cpu_mhz                : 2800
hw_caps                :
bfebfbff:20100800:00000000:00000140:0400e3bd:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 6039
free_memory            : 3124
node_to_cpu            : node0:0-1
node_to_memory         : node0:3124
xen_major              : 3
xen_minor              : 5
xen_extra              : -unstable
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=3D0xffff800000000000
xen_changeset          : Tue Sep 01 11:34:31 2009 +0100 20143:a7de5bd776ca
xen_commandline        : iommu=3D1
cc_compiler            : gcc version 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC)
cc_compile_by          : root
cc_compile_domain      : (none)
cc_compile_date        : Thu Sep 10 07:01:13 SGT 2009
xend_config_format     : 4

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 7:54 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:

> On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> >    Hi,
> >
> >    Please watch this 4-minute video at
> >    [1]http://www.youtube.com/watch?v=3DLbLaPpwNAx4
> >
> >    I have only started 3 HVM Linux guests with 1 GB ram each. I can't
> start
> >    the 4th HVM guest. If I attempt to start the 4th instance, it will
> crash
> >    dom0.
> >
> >    Are there anything in the xm dmesg output that could explain the low
> limit
> >    to the number of VMs that I could start before dom0 becomes
> unresponsive?
> >
>
> Have you limited dom0 memory (by specifying dom0_mem=3DXMB option in
> grub.conf for xen.gz) ?
>
> What does "xm info" say about free memory before starting any guests?
>
> -- Pasi
>
>
>

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No, I didn&#39;t limit dom0 memory in grub.conf.<br><br>Here&#39;s my xm in=
fo output after I have shutdown all the virtual machines.<br><br>[root@fedo=
ra11-x86-64-host ~]# xm list<br>Name=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 ID=A0=A0 Mem VCPUs=A0=A0=A0=A0=A0 State=A0=A0 Time(s)<br>
Domain-0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0 2812=A0=A0=A0=A0 2=A0=A0=A0=
=A0 r-----=A0=A0 3242.5<br>[root@fedora11-x86-64-host ~]# xm info<br>host=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : fedora11-x86-64-ho=
st<br>release=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 2.6.30-rc3-enm=
ing.teo-tip<br>
version=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : #1 SMP Wed Aug 19 23=
:14:15 SGT 2009<br>machine=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : x=
86_64<br>nr_cpus=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 2<br>nr_nod=
es=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 1<br>cores_per_socket=A0=A0=
=A0=A0=A0=A0 : 2<br>threads_per_core=A0=A0=A0=A0=A0=A0 : 1<br>cpu_mhz=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 2800<br>
hw_caps=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : bfebfbff:20100800:00=
000000:00000140:0400e3bd:00000000:00000001:00000000<br>virt_caps=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : hvm hvm_directio<br>total_memory=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0 : 6039<br>free_memory=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 : 3124<br>node_to_cpu=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : node0:0-1<br>
node_to_memory=A0=A0=A0=A0=A0=A0=A0=A0 : node0:3124<br>xen_major=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 3<br>xen_minor=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0 : 5<br>xen_extra=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : -uns=
table<br>xen_caps=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : xen-3.0-x86_6=
4 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 <br>
xen_scheduler=A0=A0=A0=A0=A0=A0=A0=A0=A0 : credit<br>xen_pagesize=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0 : 4096<br>platform_params=A0=A0=A0=A0=A0=A0=A0 : virt=
_start=3D0xffff800000000000<br>xen_changeset=A0=A0=A0=A0=A0=A0=A0=A0=A0 : T=
ue Sep 01 11:34:31 2009 +0100 20143:a7de5bd776ca<br>xen_commandline=A0=A0=
=A0=A0=A0=A0=A0 : iommu=3D1<br>
cc_compiler=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : gcc version 4.4.1 20090725 (=
Red Hat 4.4.1-2) (GCC) <br>cc_compile_by=A0=A0=A0=A0=A0=A0=A0=A0=A0 : root<=
br>cc_compile_domain=A0=A0=A0=A0=A0 : (none)<br>cc_compile_date=A0=A0=A0=A0=
=A0=A0=A0 : Thu Sep 10 07:01:13 SGT 2009<br>xend_config_format=A0=A0=A0=A0 =
: 4<br>
<br>-- <br>Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mech=
anical Engineering)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) Nat=
ional University of Singapore<br>My Primary Blog: <a href=3D"http://teo-en-=
ming-aka-zhang-enming.blogspot.com">http://teo-en-ming-aka-zhang-enming.blo=
gspot.com</a><br>
My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com">http://enming=
teo.wordpress.com</a><br>My Youtube videos: <a href=3D"http://www.youtube.c=
om/user/enmingteo">http://www.youtube.com/user/enmingteo</a><br>Email: <a h=
ref=3D"mailto:space.time.universe@gmail.com">space.time.universe@gmail.com<=
/a><br>
Mobile Phone (Starhub Prepaid): +65-8369-2618<br>Street: Bedok Reservoir Ro=
ad<br>Country: Singapore<br><br><div class=3D"gmail_quote">On Mon, Nov 9, 2=
009 at 7:54 PM, Pasi K=E4rkk=E4inen <span dir=3D"ltr">&lt;<a href=3D"mailto=
:pasik@iki.fi">pasik@iki.fi</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class=3D"im"=
>On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang Enming) w=
rote:<br>

&gt; =A0 =A0Hi,<br>
&gt;<br>
&gt; =A0 =A0Please watch this 4-minute video at<br>
</div>&gt; =A0 =A0[1]<a href=3D"http://www.youtube.com/watch?v=3DLbLaPpwNAx=
4" target=3D"_blank">http://www.youtube.com/watch?v=3DLbLaPpwNAx4</a><br>
<div class=3D"im">&gt;<br>
&gt; =A0 =A0I have only started 3 HVM Linux guests with 1 GB ram each. I ca=
n&#39;t start<br>
&gt; =A0 =A0the 4th HVM guest. If I attempt to start the 4th instance, it w=
ill crash<br>
&gt; =A0 =A0dom0.<br>
&gt;<br>
&gt; =A0 =A0Are there anything in the xm dmesg output that could explain th=
e low limit<br>
&gt; =A0 =A0to the number of VMs that I could start before dom0 becomes unr=
esponsive?<br>
&gt;<br>
<br>
</div>Have you limited dom0 memory (by specifying dom0_mem=3DXMB option in<=
br>
grub.conf for xen.gz) ?<br>
<br>
What does &quot;xm info&quot; say about free memory before starting any gue=
sts?<br>
<font color=3D"#888888"><br>
-- Pasi<br>
<br>
<br>
</font></blockquote></div><br><br clear=3D"all"><br><br>

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From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Subject: Re: Re: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 14:05:57 +0200
Message-ID: <20091109120557.GG16033@reaktio.net>
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Cc: jp.pozzi@izzop.net, xen-devel@lists.xensource.com, xen-users@lists.xensource.com, Robert Dunkley <Robert@saq.co.uk>
List-Id: xen-devel@lists.xenproject.org

On Mon, Nov 09, 2009 at 08:01:00PM +0800, Mr. Teo En Ming (Zhang Enming) =
wrote:
>    No, I didn't limit dom0 memory in grub.conf.
>=20

You should.=20

If dom0 has all the memory at boot time, you need to balloon down dom0=20
memory every time you create a new guest - this can (and will) cause=20
problems with the dom0 linux kernel.

Linux calculates some internal parameters/buffers/values based on the
_boot time_ amount of memory. And when the amount of memory goes down to
only a small fraction of that while creating new guests bad things can
happen..

It still shouldn't crash though.. I bet your problem will get fixed when
you limit the dom0 memory to say dom0_mem=3D512M and reboot.

-- Pasi

>    Here's my xm info output after I have shutdown all the virtual machi=
nes.
>=20
>    [root@fedora11-x86-64-host ~]# xm list
>    Name                                        ID   Mem VCPUs      Stat=
e
>    Time(s)
>    Domain-0                                     0  2812     2     r----=
-
>    3242.5
>    [root@fedora11-x86-64-host ~]# xm info
>    host                   : fedora11-x86-64-host
>    release                : 2.6.30-rc3-enming.teo-tip
>    version                : #1 SMP Wed Aug 19 23:14:15 SGT 2009
>    machine                : x86_64
>    nr_cpus                : 2
>    nr_nodes               : 1
>    cores_per_socket       : 2
>    threads_per_core       : 1
>    cpu_mhz                : 2800
>    hw_caps                :
>    bfebfbff:20100800:00000000:00000140:0400e3bd:00000000:00000001:00000=
000
>    virt_caps              : hvm hvm_directio
>    total_memory           : 6039
>    free_memory            : 3124
>    node_to_cpu            : node0:0-1
>    node_to_memory         : node0:3124
>    xen_major              : 3
>    xen_minor              : 5
>    xen_extra              : -unstable
>    xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_=
32
>    hvm-3.0-x86_32p hvm-3.0-x86_64
>    xen_scheduler          : credit
>    xen_pagesize           : 4096
>    platform_params        : virt_start=3D0xffff800000000000
>    xen_changeset          : Tue Sep 01 11:34:31 2009 +0100 20143:a7de5b=
d776ca
>    xen_commandline        : iommu=3D1
>    cc_compiler            : gcc version 4.4.1 20090725 (Red Hat 4.4.1-2=
)
>    (GCC)
>    cc_compile_by          : root
>    cc_compile_domain      : (none)
>    cc_compile_date        : Thu Sep 10 07:01:13 SGT 2009
>    xend_config_format     : 4
>=20
>    --
>    Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanic=
al
>    Engineering)
>    Alma Maters:
>    (1) Singapore Polytechnic
>    (2) National University of Singapore
>    My Primary Blog: [1]http://teo-en-ming-aka-zhang-enming.blogspot.com
>    My Secondary Blog: [2]http://enmingteo.wordpress.com
>    My Youtube videos: [3]http://www.youtube.com/user/enmingteo
>    Email: [4]space.time.universe@gmail.com
>    Mobile Phone (Starhub Prepaid): +65-8369-2618
>    Street: Bedok Reservoir Road
>    Country: Singapore
>=20
>    On Mon, Nov 9, 2009 at 7:54 PM, Pasi K=E4rkk=E4inen <[5]pasik@iki.fi=
> wrote:
>=20
>      On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang E=
nming)
>      wrote:
>      >    Hi,
>      >
>      >    Please watch this 4-minute video at
>      >    [1][6]http://www.youtube.com/watch?v=3DLbLaPpwNAx4
>      >
>      >    I have only started 3 HVM Linux guests with 1 GB ram each. I =
can't
>      start
>      >    the 4th HVM guest. If I attempt to start the 4th instance, it=
 will
>      crash
>      >    dom0.
>      >
>      >    Are there anything in the xm dmesg output that could explain =
the
>      low limit
>      >    to the number of VMs that I could start before dom0 becomes
>      unresponsive?
>      >
>=20
>      Have you limited dom0 memory (by specifying dom0_mem=3DXMB option =
in
>      grub.conf for xen.gz) ?
>=20
>      What does "xm info" say about free memory before starting any gues=
ts?
>      -- Pasi
>=20
> References
>=20
>    Visible links
>    1. http://teo-en-ming-aka-zhang-enming.blogspot.com/
>    2. http://enmingteo.wordpress.com/
>    3. http://www.youtube.com/user/enmingteo
>    4. mailto:space.time.universe@gmail.com
>    5. mailto:pasik@iki.fi
>    6. http://www.youtube.com/watch?v=3DLbLaPpwNAx4

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Re: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 20:14:27 +0800
Message-ID: <f712b9cf0911090414gf13a9e2w9b52a88e498a484e@mail.gmail.com>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>
	<1257685302.5339.11.camel@k2000.jpp.fr>
	<C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT>
	<f712b9cf0911090252n4e5905a4j76aacd35a5bc786d@mail.gmail.com>
	<20091109115458.GF16033@reaktio.net>
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What is a good value for dom0_mem if I want to start X server and run GNOME=
?
Will 512 MB be too little?

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 8:05 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:

> On Mon, Nov 09, 2009 at 08:01:00PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> >    No, I didn't limit dom0 memory in grub.conf.
> >
>
> You should.
>
> If dom0 has all the memory at boot time, you need to balloon down dom0
> memory every time you create a new guest - this can (and will) cause
> problems with the dom0 linux kernel.
>
> Linux calculates some internal parameters/buffers/values based on the
> _boot time_ amount of memory. And when the amount of memory goes down to
> only a small fraction of that while creating new guests bad things can
> happen..
>
> It still shouldn't crash though.. I bet your problem will get fixed when
> you limit the dom0 memory to say dom0_mem=3D512M and reboot.
>
> -- Pasi
>
> >    Here's my xm info output after I have shutdown all the virtual
> machines.
> >
> >    [root@fedora11-x86-64-host ~]# xm list
> >    Name                                        ID   Mem VCPUs      Stat=
e
> >    Time(s)
> >    Domain-0                                     0  2812     2     r----=
-
> >    3242.5
> >    [root@fedora11-x86-64-host ~]# xm info
> >    host                   : fedora11-x86-64-host
> >    release                : 2.6.30-rc3-enming.teo-tip
> >    version                : #1 SMP Wed Aug 19 23:14:15 SGT 2009
> >    machine                : x86_64
> >    nr_cpus                : 2
> >    nr_nodes               : 1
> >    cores_per_socket       : 2
> >    threads_per_core       : 1
> >    cpu_mhz                : 2800
> >    hw_caps                :
> >
>  bfebfbff:20100800:00000000:00000140:0400e3bd:00000000:00000001:00000000
> >    virt_caps              : hvm hvm_directio
> >    total_memory           : 6039
> >    free_memory            : 3124
> >    node_to_cpu            : node0:0-1
> >    node_to_memory         : node0:3124
> >    xen_major              : 3
> >    xen_minor              : 5
> >    xen_extra              : -unstable
> >    xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_=
32
> >    hvm-3.0-x86_32p hvm-3.0-x86_64
> >    xen_scheduler          : credit
> >    xen_pagesize           : 4096
> >    platform_params        : virt_start=3D0xffff800000000000
> >    xen_changeset          : Tue Sep 01 11:34:31 2009 +0100
> 20143:a7de5bd776ca
> >    xen_commandline        : iommu=3D1
> >    cc_compiler            : gcc version 4.4.1 20090725 (Red Hat 4.4.1-2=
)
> >    (GCC)
> >    cc_compile_by          : root
> >    cc_compile_domain      : (none)
> >    cc_compile_date        : Thu Sep 10 07:01:13 SGT 2009
> >    xend_config_format     : 4
> >
> >    --
> >    Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanic=
al
> >    Engineering)
> >    Alma Maters:
> >    (1) Singapore Polytechnic
> >    (2) National University of Singapore
> >    My Primary Blog: [1]http://teo-en-ming-aka-zhang-enming.blogspot.com
> >    My Secondary Blog: [2]http://enmingteo.wordpress.com
> >    My Youtube videos: [3]http://www.youtube.com/user/enmingteo
> >    Email: [4]space.time.universe@gmail.com
> >    Mobile Phone (Starhub Prepaid): +65-8369-2618
> >    Street: Bedok Reservoir Road
> >    Country: Singapore
> >
> >    On Mon, Nov 9, 2009 at 7:54 PM, Pasi K=E4rkk=E4inen <[5]pasik@iki.fi=
>
> wrote:
> >
> >      On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang
> Enming)
> >      wrote:
> >      >    Hi,
> >      >
> >      >    Please watch this 4-minute video at
> >      >    [1][6]http://www.youtube.com/watch?v=3DLbLaPpwNAx4
> >      >
> >      >    I have only started 3 HVM Linux guests with 1 GB ram each. I
> can't
> >      start
> >      >    the 4th HVM guest. If I attempt to start the 4th instance, it
> will
> >      crash
> >      >    dom0.
> >      >
> >      >    Are there anything in the xm dmesg output that could explain
> the
> >      low limit
> >      >    to the number of VMs that I could start before dom0 becomes
> >      unresponsive?
> >      >
> >
> >      Have you limited dom0 memory (by specifying dom0_mem=3DXMB option =
in
> >      grub.conf for xen.gz) ?
> >
> >      What does "xm info" say about free memory before starting any
> guests?
> >      -- Pasi
> >
> > References
> >
> >    Visible links
> >    1. http://teo-en-ming-aka-zhang-enming.blogspot.com/
> >    2. http://enmingteo.wordpress.com/
> >    3. http://www.youtube.com/user/enmingteo
> >    4. mailto:space.time.universe@gmail.com
> >    5. mailto:pasik@iki.fi
> >    6. http://www.youtube.com/watch?v=3DLbLaPpwNAx4
>

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What is a good value for dom0_mem if I want to start X server and run GNOME=
? Will 512 MB be too little?<br><br>-- <br>Mr. Teo En Ming (Zhang Enming) D=
ip(Mechatronics) BEng(Hons)(Mechanical Engineering)<br>Alma Maters:<br>(1) =
Singapore Polytechnic<br>
(2) National University of Singapore<br>My Primary Blog: <a href=3D"http://=
teo-en-ming-aka-zhang-enming.blogspot.com">http://teo-en-ming-aka-zhang-enm=
ing.blogspot.com</a><br>My Secondary Blog: <a href=3D"http://enmingteo.word=
press.com">http://enmingteo.wordpress.com</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Mon, Nov 9, 2009 at 8:05 PM, Pasi K=E4rkk=E4inen <span dir=3D"=
ltr">&lt;<a href=3D"mailto:pasik@iki.fi">pasik@iki.fi</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(2=
04, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class=3D"im">On Mon, Nov 09, 2009 at 08:01:00PM +0800, Mr. Teo En Ming=
 (Zhang Enming) wrote:<br>
&gt; =A0 =A0No, I didn&#39;t limit dom0 memory in grub.conf.<br>
&gt;<br>
<br>
</div>You should.<br>
<br>
If dom0 has all the memory at boot time, you need to balloon down dom0<br>
memory every time you create a new guest - this can (and will) cause<br>
problems with the dom0 linux kernel.<br>
<br>
Linux calculates some internal parameters/buffers/values based on the<br>
_boot time_ amount of memory. And when the amount of memory goes down to<br=
>
only a small fraction of that while creating new guests bad things can<br>
happen..<br>
<br>
It still shouldn&#39;t crash though.. I bet your problem will get fixed whe=
n<br>
you limit the dom0 memory to say dom0_mem=3D512M and reboot.<br>
<br>
-- Pasi<br>
<div><div></div><div class=3D"h5"><br>
&gt; =A0 =A0Here&#39;s my xm info output after I have shutdown all the virt=
ual machines.<br>
&gt;<br>
&gt; =A0 =A0[root@fedora11-x86-64-host ~]# xm list<br>
&gt; =A0 =A0Name =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0ID =A0 Mem VCPUs =A0 =A0 =A0State<br>
&gt; =A0 =A0Time(s)<br>
&gt; =A0 =A0Domain-0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 0 =A02812 =A0 =A0 2 =A0 =A0 r-----<br>
&gt; =A0 =A03242.5<br>
&gt; =A0 =A0[root@fedora11-x86-64-host ~]# xm info<br>
&gt; =A0 =A0host =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 : fedora11-x86-64-host=
<br>
&gt; =A0 =A0release =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: 2.6.30-rc3-enming.teo-=
tip<br>
&gt; =A0 =A0version =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: #1 SMP Wed Aug 19 23:1=
4:15 SGT 2009<br>
&gt; =A0 =A0machine =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: x86_64<br>
&gt; =A0 =A0nr_cpus =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: 2<br>
&gt; =A0 =A0nr_nodes =A0 =A0 =A0 =A0 =A0 =A0 =A0 : 1<br>
&gt; =A0 =A0cores_per_socket =A0 =A0 =A0 : 2<br>
&gt; =A0 =A0threads_per_core =A0 =A0 =A0 : 1<br>
&gt; =A0 =A0cpu_mhz =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: 2800<br>
&gt; =A0 =A0hw_caps =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0:<br>
&gt; =A0 =A0bfebfbff:20100800:00000000:00000140:0400e3bd:00000000:00000001:=
00000000<br>
&gt; =A0 =A0virt_caps =A0 =A0 =A0 =A0 =A0 =A0 =A0: hvm hvm_directio<br>
&gt; =A0 =A0total_memory =A0 =A0 =A0 =A0 =A0 : 6039<br>
&gt; =A0 =A0free_memory =A0 =A0 =A0 =A0 =A0 =A0: 3124<br>
&gt; =A0 =A0node_to_cpu =A0 =A0 =A0 =A0 =A0 =A0: node0:0-1<br>
&gt; =A0 =A0node_to_memory =A0 =A0 =A0 =A0 : node0:3124<br>
&gt; =A0 =A0xen_major =A0 =A0 =A0 =A0 =A0 =A0 =A0: 3<br>
&gt; =A0 =A0xen_minor =A0 =A0 =A0 =A0 =A0 =A0 =A0: 5<br>
&gt; =A0 =A0xen_extra =A0 =A0 =A0 =A0 =A0 =A0 =A0: -unstable<br>
&gt; =A0 =A0xen_caps =A0 =A0 =A0 =A0 =A0 =A0 =A0 : xen-3.0-x86_64 xen-3.0-x=
86_32p hvm-3.0-x86_32<br>
&gt; =A0 =A0hvm-3.0-x86_32p hvm-3.0-x86_64<br>
&gt; =A0 =A0xen_scheduler =A0 =A0 =A0 =A0 =A0: credit<br>
&gt; =A0 =A0xen_pagesize =A0 =A0 =A0 =A0 =A0 : 4096<br>
&gt; =A0 =A0platform_params =A0 =A0 =A0 =A0: virt_start=3D0xffff80000000000=
0<br>
&gt; =A0 =A0xen_changeset =A0 =A0 =A0 =A0 =A0: Tue Sep 01 11:34:31 2009 +01=
00 20143:a7de5bd776ca<br>
&gt; =A0 =A0xen_commandline =A0 =A0 =A0 =A0: iommu=3D1<br>
&gt; =A0 =A0cc_compiler =A0 =A0 =A0 =A0 =A0 =A0: gcc version 4.4.1 20090725=
 (Red Hat 4.4.1-2)<br>
&gt; =A0 =A0(GCC)<br>
&gt; =A0 =A0cc_compile_by =A0 =A0 =A0 =A0 =A0: root<br>
&gt; =A0 =A0cc_compile_domain =A0 =A0 =A0: (none)<br>
&gt; =A0 =A0cc_compile_date =A0 =A0 =A0 =A0: Thu Sep 10 07:01:13 SGT 2009<b=
r>
&gt; =A0 =A0xend_config_format =A0 =A0 : 4<br>
&gt;<br>
&gt; =A0 =A0--<br>
&gt; =A0 =A0Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mec=
hanical<br>
&gt; =A0 =A0Engineering)<br>
&gt; =A0 =A0Alma Maters:<br>
&gt; =A0 =A0(1) Singapore Polytechnic<br>
&gt; =A0 =A0(2) National University of Singapore<br>
</div></div>&gt; =A0 =A0My Primary Blog: [1]<a href=3D"http://teo-en-ming-a=
ka-zhang-enming.blogspot.com" target=3D"_blank">http://teo-en-ming-aka-zhan=
g-enming.blogspot.com</a><br>
&gt; =A0 =A0My Secondary Blog: [2]<a href=3D"http://enmingteo.wordpress.com=
" target=3D"_blank">http://enmingteo.wordpress.com</a><br>
&gt; =A0 =A0My Youtube videos: [3]<a href=3D"http://www.youtube.com/user/en=
mingteo" target=3D"_blank">http://www.youtube.com/user/enmingteo</a><br>
&gt; =A0 =A0Email: [4]<a href=3D"mailto:space.time.universe@gmail.com">spac=
e.time.universe@gmail.com</a><br>
<div class=3D"im">&gt; =A0 =A0Mobile Phone (Starhub Prepaid): +65-8369-2618=
<br>
&gt; =A0 =A0Street: Bedok Reservoir Road<br>
&gt; =A0 =A0Country: Singapore<br>
&gt;<br>
</div><div class=3D"im">&gt; =A0 =A0On Mon, Nov 9, 2009 at 7:54 PM, Pasi K=
=E4rkk=E4inen &lt;[5]<a href=3D"mailto:pasik@iki.fi">pasik@iki.fi</a>&gt; w=
rote:<br>
&gt;<br>
&gt; =A0 =A0 =A0On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (=
Zhang Enming)<br>
&gt; =A0 =A0 =A0wrote:<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0Hi,<br>
&gt; =A0 =A0 =A0&gt;<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0Please watch this 4-minute video at<br>
</div>&gt; =A0 =A0 =A0&gt; =A0 =A0[1][6]<a href=3D"http://www.youtube.com/w=
atch?v=3DLbLaPpwNAx4" target=3D"_blank">http://www.youtube.com/watch?v=3DLb=
LaPpwNAx4</a><br>
<div class=3D"im">&gt; =A0 =A0 =A0&gt;<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0I have only started 3 HVM Linux guests with 1 G=
B ram each. I can&#39;t<br>
&gt; =A0 =A0 =A0start<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0the 4th HVM guest. If I attempt to start the 4t=
h instance, it will<br>
&gt; =A0 =A0 =A0crash<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0dom0.<br>
&gt; =A0 =A0 =A0&gt;<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0Are there anything in the xm dmesg output that =
could explain the<br>
&gt; =A0 =A0 =A0low limit<br>
&gt; =A0 =A0 =A0&gt; =A0 =A0to the number of VMs that I could start before =
dom0 becomes<br>
&gt; =A0 =A0 =A0unresponsive?<br>
&gt; =A0 =A0 =A0&gt;<br>
&gt;<br>
&gt; =A0 =A0 =A0Have you limited dom0 memory (by specifying dom0_mem=3DXMB =
option in<br>
&gt; =A0 =A0 =A0grub.conf for xen.gz) ?<br>
&gt;<br>
&gt; =A0 =A0 =A0What does &quot;xm info&quot; say about free memory before =
starting any guests?<br>
&gt; =A0 =A0 =A0-- Pasi<br>
&gt;<br>
</div>&gt; References<br>
&gt;<br>
&gt; =A0 =A0Visible links<br>
&gt; =A0 =A01. <a href=3D"http://teo-en-ming-aka-zhang-enming.blogspot.com/=
" target=3D"_blank">http://teo-en-ming-aka-zhang-enming.blogspot.com/</a><b=
r>
&gt; =A0 =A02. <a href=3D"http://enmingteo.wordpress.com/" target=3D"_blank=
">http://enmingteo.wordpress.com/</a><br>
&gt; =A0 =A03. <a href=3D"http://www.youtube.com/user/enmingteo" target=3D"=
_blank">http://www.youtube.com/user/enmingteo</a><br>
&gt; =A0 =A04. mailto:<a href=3D"mailto:space.time.universe@gmail.com">spac=
e.time.universe@gmail.com</a><br>
&gt; =A0 =A05. mailto:<a href=3D"mailto:pasik@iki.fi">pasik@iki.fi</a><br>
&gt; =A0 =A06. <a href=3D"http://www.youtube.com/watch?v=3DLbLaPpwNAx4" tar=
get=3D"_blank">http://www.youtube.com/watch?v=3DLbLaPpwNAx4</a><br>
</blockquote></div><br><br clear=3D"all"><br><br>

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_______________________________________________
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From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Subject: Re: Re: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 14:18:11 +0200
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List-Id: xen-devel@lists.xenproject.org

On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    What is a good value for dom0_mem if I want to start X server and run
>    GNOME? Will 512 MB be too little?
> 

Go for 1024 MB then..

-- Pasi

From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: Re: [Xen-users] Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 21:10:49 +0800
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Great! After setting dom0_mem=3D1024M, I can start all 5 nodes of my Rocks =
HPC
cluster without crashing dom0 as compared to the previous limit of 3 nodes
when I did not set dom0_mem.

Thank you Pasi! Another resource problem solved.

Here's my latest grub.conf:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro
root=3D/dev/mapper/vg_fedora11_host-lv_root
#          initrd /initrd-version.img
#boot=3D/dev/sda
default=3D4
timeout=3D100
splashimage=3D(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.31.5-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.5-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.31.5-xen-enming.teo.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.31.5-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodese=
t
    module /initrd-2.6.31.5-xen-enming.teo.img
title Fedora (2.6.31.4-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.4-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.31.4-xen-enming.teo.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.31.4-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodese=
t
    module /initrd-2.6.31.4-xen-enming.teo.img
title Fedora (2.6.31.1-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.1-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.31.1-xen-enming.teo.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.31.1-xen-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodese=
t
    module /initrd-2.6.31.1-xen-enming.teo.img
title Fedora (2.6.31-enming.teo)
    root (hd0,0)
    kernel /vmlinuz-2.6.31-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
    initrd /initrd-2.6.31-enming.teo.img
title Fedora (2.6.30.5-enming.teo)
    root (hd0,0)
    kernel /vmlinuz-2.6.30.5-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
    initrd /initrd-2.6.30.5-enming.teo.img
title Fedora (2.6.18.8-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.18.8-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.18.8-enming.teo.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.18.8-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root
    module /initrd-2.6.18.8-enming.teo.img
title Fedora (2.6.31-rc6-enming.teo) with Serial Console
        root (hd0,0)
#       kernel /vmlinuz-2.6.31-rc6-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#       initrd /initrd-2.6.31-rc6-enming.teo.img
        kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_mapping=
=3D1
com1=3D115200,8n1 console=3Dcom1
#       module /vmlinuz-2.6.31-rc6-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0
console=3DttyS0,115200
    module /vmlinuz-2.6.31-rc6-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0
earlyprintk=3Dxen
        module /initrd-2.6.31-rc6-enming.teo.img
title Fedora (2.6.30-rc3-enming.teo-tip) with Serial Console
        root (hd0,0)
#       kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#       initrd /initrd-2.6.30-rc3-enming.teo-tip.img
        kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_mapping=
=3D1
com1=3D115200,8n1 console=3Dcom1
#       module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0
console=3DttyS0,115200
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0
earlyprintk=3Dxen
        module /initrd-2.6.30-rc3-enming.teo-tip.img

title Fedora (2.6.31-rc6-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31-rc6-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.31-rc6-enming.teo.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.31-rc6-enming.teo ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodese=
t
    module /initrd-2.6.31-rc6-enming.teo.img
title Fedora (2.6.30-rc3-enming.teo-tip)
    root (hd0,0)
#    kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
#    initrd /initrd-2.6.30-rc3-enming.teo-tip.img
    kernel /xen.gz dom0_mem=3D1024M iommu=3D1
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodese=
t
    module /initrd-2.6.30-rc3-enming.teo-tip.img
title Fedora (2.6.29.4-167.fc11.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.29.4-167.fc11.x86_64 ro
root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
    initrd /initrd-2.6.29.4-167.fc11.x86_64.img

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 8:18 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:

> On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> >    What is a good value for dom0_mem if I want to start X server and ru=
n
> >    GNOME? Will 512 MB be too little?
> >
>
> Go for 1024 MB then..
>
> -- Pasi
>
>

--00163645726e1d721f0477efec27
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Great! After setting dom0_mem=3D1024M, I can start all 5 nodes of my Rocks =
HPC cluster without crashing dom0 as compared to the previous limit of 3 no=
des when I did not set dom0_mem.<br><br>Thank you Pasi! Another resource pr=
oblem solved.<br>
<br>Here&#39;s my latest grub.conf:<br><br># grub.conf generated by anacond=
a<br>#<br># Note that you do not have to rerun grub after making changes to=
 this file<br># NOTICE:=A0 You have a /boot partition.=A0 This means that<b=
r>
#=A0=A0=A0=A0=A0=A0=A0=A0=A0 all kernel and initrd paths are relative to /b=
oot/, eg.<br>#=A0=A0=A0=A0=A0=A0=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=
=A0=A0=A0=A0 kernel /vmlinuz-version ro root=3D/dev/mapper/vg_fedora11_host=
-lv_root<br>#=A0=A0=A0=A0=A0=A0=A0=A0=A0 initrd /initrd-version.img<br>
#boot=3D/dev/sda<br>default=3D4<br>timeout=3D100<br>splashimage=3D(hd0,0)/g=
rub/splash.xpm.gz<br>hiddenmenu<br>title Fedora (2.6.31.5-xen-enming.teo)<b=
r>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31.5-xen-enming.=
teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<b=
r>
#=A0=A0=A0 initrd /initrd-2.6.31.5-xen-enming.teo.img<br>=A0=A0=A0 kernel /=
xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vmlinuz-2.6.31.5-xen=
-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selin=
ux=3D0 nomodeset<br>=A0=A0=A0 module /initrd-2.6.31.5-xen-enming.teo.img<br=
>
title Fedora (2.6.31.4-xen-enming.teo)<br>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=
=A0 kernel /vmlinuz-2.6.31.4-xen-enming.teo ro root=3D/dev/mapper/vg_fedora=
11_host-lv_root rhgb quiet selinux=3D0<br>#=A0=A0=A0 initrd /initrd-2.6.31.=
4-xen-enming.teo.img<br>
=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vm=
linuz-2.6.31.4-xen-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_roo=
t rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module /initrd-2.6.31.4-xen=
-enming.teo.img<br>title Fedora (2.6.31.1-xen-enming.teo)<br>
=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31.1-xen-enming.te=
o ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>=
#=A0=A0=A0 initrd /initrd-2.6.31.1-xen-enming.teo.img<br>=A0=A0=A0 kernel /=
xen.gz dom0_mem=3D1024M iommu=3D1<br>
=A0=A0=A0 module /vmlinuz-2.6.31.1-xen-enming.teo ro root=3D/dev/mapper/vg_=
fedora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module =
/initrd-2.6.31.1-xen-enming.teo.img<br>title Fedora (2.6.31-enming.teo)<br>=
=A0=A0=A0 root (hd0,0)<br>
=A0=A0=A0 kernel /vmlinuz-2.6.31-enming.teo ro root=3D/dev/mapper/vg_fedora=
11_host-lv_root rhgb quiet selinux=3D0<br>=A0=A0=A0 initrd /initrd-2.6.31-e=
nming.teo.img<br>title Fedora (2.6.30.5-enming.teo)<br>=A0=A0=A0 root (hd0,=
0)<br>=A0=A0=A0 kernel /vmlinuz-2.6.30.5-enming.teo ro root=3D/dev/mapper/v=
g_fedora11_host-lv_root rhgb quiet selinux=3D0<br>
=A0=A0=A0 initrd /initrd-2.6.30.5-enming.teo.img<br>title Fedora (2.6.18.8-=
enming.teo)<br>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.18.=
8-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet seli=
nux=3D0<br>#=A0=A0=A0 initrd /initrd-2.6.18.8-enming.teo.img<br>
=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vm=
linuz-2.6.18.8-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root=A0=
 <br>=A0=A0=A0 module /initrd-2.6.18.8-enming.teo.img<br>title Fedora (2.6.=
31-rc6-enming.teo) with Serial Console<br>
=A0=A0=A0=A0=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=A0 kernel /vmlinuz-2=
.6.31-rc6-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb qu=
iet selinux=3D0<br>#=A0=A0=A0=A0=A0=A0 initrd /initrd-2.6.31-rc6-enming.teo=
.img<br>=A0=A0=A0=A0=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iom=
mu_inclusive_mapping=3D1 com1=3D115200,8n1 console=3Dcom1<br>
#=A0=A0=A0=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/ma=
pper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0 console=3DttyS0,1=
15200 <br>=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/ma=
pper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0 earlyprintk=3Dxen<=
br>
=A0=A0=A0=A0=A0=A0=A0 module /initrd-2.6.31-rc6-enming.teo.img<br>title Fed=
ora (2.6.30-rc3-enming.teo-tip) with Serial Console<br>=A0=A0=A0=A0=A0=A0=
=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=A0 kernel /vmlinuz-2.6.30-rc3-enming.t=
eo-tip ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D=
0<br>
#=A0=A0=A0=A0=A0=A0 initrd /initrd-2.6.30-rc3-enming.teo-tip.img<br>=A0=A0=
=A0=A0=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_m=
apping=3D1 com1=3D115200,8n1 console=3Dcom1<br>#=A0=A0=A0=A0=A0=A0 module /=
vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/vg_fedora11_host-lv=
_root selinux=3D0 xencons=3DttyS0 console=3DttyS0,115200 <br>
=A0=A0=A0 module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/v=
g_fedora11_host-lv_root selinux=3D0 console=3Dhvc0 earlyprintk=3Dxen<br>=A0=
=A0=A0=A0=A0=A0=A0 module /initrd-2.6.30-rc3-enming.teo-tip.img<br><br>titl=
e Fedora (2.6.31-rc6-enming.teo)<br>
=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31-rc6-enming.teo =
ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>#=
=A0=A0=A0 initrd /initrd-2.6.31-rc6-enming.teo.img<br>=A0=A0=A0 kernel /xen=
.gz dom0_mem=3D1024M iommu=3D1<br>
=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/mapper/vg_fe=
dora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module /i=
nitrd-2.6.31-rc6-enming.teo.img<br>title Fedora (2.6.30-rc3-enming.teo-tip)=
<br>=A0=A0=A0 root (hd0,0)<br>
#=A0=A0=A0 kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/=
vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>#=A0=A0=A0 initrd /initr=
d-2.6.30-rc3-enming.teo-tip.img<br>=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024=
M iommu=3D1<br>=A0=A0=A0 module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=
=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br=
>
=A0=A0=A0 module /initrd-2.6.30-rc3-enming.teo-tip.img<br>title Fedora (2.6=
.29.4-167.fc11.x86_64)<br>=A0=A0=A0 root (hd0,0)<br>=A0=A0=A0 kernel /vmlin=
uz-2.6.29.4-167.fc11.x86_64 ro root=3D/dev/mapper/vg_fedora11_host-lv_root =
rhgb quiet selinux=3D0<br>
=A0=A0=A0 initrd /initrd-2.6.29.4-167.fc11.x86_64.img<br><br>-- <br>Mr. Teo=
 En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering=
)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National University o=
f Singapore<br>
My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogspot.co=
m">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Secondary Blo=
g: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wordpress.co=
m</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Mon, Nov 9, 2009 at 8:18 PM, Pasi K=E4rkk=E4inen <span dir=3D"=
ltr">&lt;<a href=3D"mailto:pasik@iki.fi">pasik@iki.fi</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(2=
04, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class=3D"im">On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming=
 (Zhang Enming) wrote:<br>
&gt; =A0 =A0What is a good value for dom0_mem if I want to start X server a=
nd run<br>
&gt; =A0 =A0GNOME? Will 512 MB be too little?<br>
&gt;<br>
<br>
</div>Go for 1024 MB then..<br>
<font color=3D"#888888"><br>
-- Pasi<br>
<br>
</font></blockquote></div><br><br clear=3D"all"><br><br>

--00163645726e1d721f0477efec27--


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From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Subject: Re: [Xen-devel] Re: Max. PV and HVM Guests
Date: Mon, 9 Nov 2009 22:37:21 +0800
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Hi All,

I have discovered that setting dom0_mem also solves another problem I am
facing.

Previously I have complained that, after starting a HVM guest, in any pv-op=
s
dom0 kernels 2.6.31.X, dom0 will be very slow, sluggish, and unresponsive,
such that it is nearly impossible to start another HVM virtual machine.

Now, after setting dom0_mem, I booted up into pvops dom0 kernel 2.6.31.5, I
started all 5 Rocks HPC cluster compute nodes at one go. And guess what?
Dom0 is not even sluggish! I could still do desktop screen video capturing!

Voila! Setting dom0_mem is really killing two birds with one stone. It
raises the number of VMs that I can start and also resolves the sluggishnes=
s
in dom0 (pvops kernels 2.6.31.X affected; 2.6.30-rc3 is NOT affected) after
starting a virtual machine.

Setting dom0_mem really does wonders.

Thank you Pasi!

--=20
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 9:10 PM, Mr. Teo En Ming (Zhang Enming) <
space.time.universe@gmail.com> wrote:

> Great! After setting dom0_mem=3D1024M, I can start all 5 nodes of my Rock=
s
> HPC cluster without crashing dom0 as compared to the previous limit of 3
> nodes when I did not set dom0_mem.
>
> Thank you Pasi! Another resource problem solved.
>
> Here's my latest grub.conf:
>
> # grub.conf generated by anaconda
> #
> # Note that you do not have to rerun grub after making changes to this fi=
le
> # NOTICE:  You have a /boot partition.  This means that
> #          all kernel and initrd paths are relative to /boot/, eg.
> #          root (hd0,0)
> #          kernel /vmlinuz-version ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root
> #          initrd /initrd-version.img
> #boot=3D/dev/sda
> default=3D4
> timeout=3D100
> splashimage=3D(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title Fedora (2.6.31.5-xen-enming.teo)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.31.5-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.31.5-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.31.5-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomode=
set
>     module /initrd-2.6.31.5-xen-enming.teo.img
> title Fedora (2.6.31.4-xen-enming.teo)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.31.4-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.31.4-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.31.4-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomode=
set
>     module /initrd-2.6.31.4-xen-enming.teo.img
> title Fedora (2.6.31.1-xen-enming.teo)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.31.1-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.31.1-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.31.1-xen-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomode=
set
>     module /initrd-2.6.31.1-xen-enming.teo.img
> title Fedora (2.6.31-enming.teo)
>     root (hd0,0)
>     kernel /vmlinuz-2.6.31-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
>     initrd /initrd-2.6.31-enming.teo.img
> title Fedora (2.6.30.5-enming.teo)
>     root (hd0,0)
>     kernel /vmlinuz-2.6.30.5-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
>     initrd /initrd-2.6.30.5-enming.teo.img
> title Fedora (2.6.18.8-enming.teo)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.18.8-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.18.8-enming.teo.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.18.8-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root
>     module /initrd-2.6.18.8-enming.teo.img
> title Fedora (2.6.31-rc6-enming.teo) with Serial Console
>         root (hd0,0)
> #       kernel /vmlinuz-2.6.31-rc6-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #       initrd /initrd-2.6.31-rc6-enming.teo.img
>         kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_mapping=
=3D1
> com1=3D115200,8n1 console=3Dcom1
> #       module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0
> console=3DttyS0,115200
>     module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0
> earlyprintk=3Dxen
>         module /initrd-2.6.31-rc6-enming.teo.img
> title Fedora (2.6.30-rc3-enming.teo-tip) with Serial Console
>         root (hd0,0)
> #       kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #       initrd /initrd-2.6.30-rc3-enming.teo-tip.img
>         kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_mapping=
=3D1
> com1=3D115200,8n1 console=3Dcom1
> #       module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0
> console=3DttyS0,115200
>     module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0
> earlyprintk=3Dxen
>         module /initrd-2.6.30-rc3-enming.teo-tip.img
>
> title Fedora (2.6.31-rc6-enming.teo)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.31-rc6-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.31-rc6-enming.teo.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomode=
set
>     module /initrd-2.6.31-rc6-enming.teo.img
> title Fedora (2.6.30-rc3-enming.teo-tip)
>     root (hd0,0)
> #    kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
> #    initrd /initrd-2.6.30-rc3-enming.teo-tip.img
>     kernel /xen.gz dom0_mem=3D1024M iommu=3D1
>     module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomode=
set
>     module /initrd-2.6.30-rc3-enming.teo-tip.img
> title Fedora (2.6.29.4-167.fc11.x86_64)
>     root (hd0,0)
>     kernel /vmlinuz-2.6.29.4-167.fc11.x86_64 ro
> root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0
>     initrd /initrd-2.6.29.4-167.fc11.x86_64.img
>
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>
> On Mon, Nov 9, 2009 at 8:18 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:
>
>> On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming (Zhang Enming)
>> wrote:
>> >    What is a good value for dom0_mem if I want to start X server and r=
un
>> >    GNOME? Will 512 MB be too little?
>> >
>>
>> Go for 1024 MB then..
>>
>> -- Pasi
>>
>>
>
>
>
>

--0016364266c3a1ca440477f12106
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi All,<br><br>I have discovered that setting dom0_mem also solves another =
problem I am facing.<br><br>Previously I have complained that, after starti=
ng a HVM guest, in any pv-ops dom0 kernels 2.6.31.X, dom0 will be very slow=
, sluggish, and unresponsive, such that it is nearly impossible to start an=
other HVM virtual machine.<br>
<br>Now, after setting dom0_mem, I booted up into pvops dom0 kernel 2.6.31.=
5, I started all 5 Rocks HPC cluster compute nodes at one go. And guess wha=
t? Dom0 is not even sluggish! I could still do desktop screen video capturi=
ng!<br>
<br>Voila! Setting dom0_mem is really killing two birds with one stone. It =
raises the number of VMs that I can start and also resolves the sluggishnes=
s in dom0 (pvops kernels 2.6.31.X affected; 2.6.30-rc3 is NOT affected) aft=
er starting a virtual machine.<br>
<br>Setting dom0_mem really does wonders.<br><br>Thank you Pasi!<br><br>-- =
<br>Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical =
Engineering)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) National U=
niversity of Singapore<br>
My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogspot.co=
m">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><br>My Secondary Blo=
g: <a href=3D"http://enmingteo.wordpress.com">http://enmingteo.wordpress.co=
m</a><br>
My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo">http:/=
/www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"mailto:space.time.=
universe@gmail.com">space.time.universe@gmail.com</a><br>Mobile Phone (Star=
hub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br><div class=3D"gma=
il_quote">On Mon, Nov 9, 2009 at 9:10 PM, Mr. Teo En Ming (Zhang Enming) <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:space.time.universe@gmail.com">space.=
time.universe@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Great! After sett=
ing dom0_mem=3D1024M, I can start all 5 nodes of my Rocks HPC cluster witho=
ut crashing dom0 as compared to the previous limit of 3 nodes when I did no=
t set dom0_mem.<br>
<br>Thank you Pasi! Another resource problem solved.<br>
<br>Here&#39;s my latest grub.conf:<br><br># grub.conf generated by anacond=
a<br>#<br># Note that you do not have to rerun grub after making changes to=
 this file<br># NOTICE:=A0 You have a /boot partition.=A0 This means that<b=
r>

#=A0=A0=A0=A0=A0=A0=A0=A0=A0 all kernel and initrd paths are relative to /b=
oot/, eg.<br>#=A0=A0=A0=A0=A0=A0=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=
=A0=A0=A0=A0 kernel /vmlinuz-version ro root=3D/dev/mapper/vg_fedora11_host=
-lv_root<br>#=A0=A0=A0=A0=A0=A0=A0=A0=A0 initrd /initrd-version.img<br>

#boot=3D/dev/sda<br>default=3D4<br>timeout=3D100<br>splashimage=3D(hd0,0)/g=
rub/splash.xpm.gz<br>hiddenmenu<br>title Fedora (2.6.31.5-xen-enming.teo)<b=
r>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31.5-xen-enming.=
teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<b=
r>

#=A0=A0=A0 initrd /initrd-2.6.31.5-xen-enming.teo.img<br>=A0=A0=A0 kernel /=
xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vmlinuz-2.6.31.5-xen=
-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selin=
ux=3D0 nomodeset<br>=A0=A0=A0 module /initrd-2.6.31.5-xen-enming.teo.img<br=
>

title Fedora (2.6.31.4-xen-enming.teo)<br>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=
=A0 kernel /vmlinuz-2.6.31.4-xen-enming.teo ro root=3D/dev/mapper/vg_fedora=
11_host-lv_root rhgb quiet selinux=3D0<br>#=A0=A0=A0 initrd /initrd-2.6.31.=
4-xen-enming.teo.img<br>

=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vm=
linuz-2.6.31.4-xen-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_roo=
t rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module /initrd-2.6.31.4-xen=
-enming.teo.img<br>title Fedora (2.6.31.1-xen-enming.teo)<br>

=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31.1-xen-enming.te=
o ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>=
#=A0=A0=A0 initrd /initrd-2.6.31.1-xen-enming.teo.img<br>=A0=A0=A0 kernel /=
xen.gz dom0_mem=3D1024M iommu=3D1<br>

=A0=A0=A0 module /vmlinuz-2.6.31.1-xen-enming.teo ro root=3D/dev/mapper/vg_=
fedora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module =
/initrd-2.6.31.1-xen-enming.teo.img<br>title Fedora (2.6.31-enming.teo)<br>=
=A0=A0=A0 root (hd0,0)<br>

=A0=A0=A0 kernel /vmlinuz-2.6.31-enming.teo ro root=3D/dev/mapper/vg_fedora=
11_host-lv_root rhgb quiet selinux=3D0<br>=A0=A0=A0 initrd /initrd-2.6.31-e=
nming.teo.img<br>title Fedora (2.6.30.5-enming.teo)<br>=A0=A0=A0 root (hd0,=
0)<br>=A0=A0=A0 kernel /vmlinuz-2.6.30.5-enming.teo ro root=3D/dev/mapper/v=
g_fedora11_host-lv_root rhgb quiet selinux=3D0<br>

=A0=A0=A0 initrd /initrd-2.6.30.5-enming.teo.img<br>title Fedora (2.6.18.8-=
enming.teo)<br>=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.18.=
8-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet seli=
nux=3D0<br>#=A0=A0=A0 initrd /initrd-2.6.18.8-enming.teo.img<br>

=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1<br>=A0=A0=A0 module /vm=
linuz-2.6.18.8-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root=A0=
 <br>=A0=A0=A0 module /initrd-2.6.18.8-enming.teo.img<br>title Fedora (2.6.=
31-rc6-enming.teo) with Serial Console<br>

=A0=A0=A0=A0=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=A0 kernel /vmlinuz-2=
.6.31-rc6-enming.teo ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb qu=
iet selinux=3D0<br>#=A0=A0=A0=A0=A0=A0 initrd /initrd-2.6.31-rc6-enming.teo=
.img<br>=A0=A0=A0=A0=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iom=
mu_inclusive_mapping=3D1 com1=3D115200,8n1 console=3Dcom1<br>

#=A0=A0=A0=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/ma=
pper/vg_fedora11_host-lv_root selinux=3D0 xencons=3DttyS0 console=3DttyS0,1=
15200 <br>=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/ma=
pper/vg_fedora11_host-lv_root selinux=3D0 console=3Dhvc0 earlyprintk=3Dxen<=
br>

=A0=A0=A0=A0=A0=A0=A0 module /initrd-2.6.31-rc6-enming.teo.img<br>title Fed=
ora (2.6.30-rc3-enming.teo-tip) with Serial Console<br>=A0=A0=A0=A0=A0=A0=
=A0 root (hd0,0)<br>#=A0=A0=A0=A0=A0=A0 kernel /vmlinuz-2.6.30-rc3-enming.t=
eo-tip ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D=
0<br>

#=A0=A0=A0=A0=A0=A0 initrd /initrd-2.6.30-rc3-enming.teo-tip.img<br>=A0=A0=
=A0=A0=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024M iommu=3D1 iommu_inclusive_m=
apping=3D1 com1=3D115200,8n1 console=3Dcom1<br>#=A0=A0=A0=A0=A0=A0 module /=
vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/vg_fedora11_host-lv=
_root selinux=3D0 xencons=3DttyS0 console=3DttyS0,115200 <br>

=A0=A0=A0 module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/v=
g_fedora11_host-lv_root selinux=3D0 console=3Dhvc0 earlyprintk=3Dxen<br>=A0=
=A0=A0=A0=A0=A0=A0 module /initrd-2.6.30-rc3-enming.teo-tip.img<br><br>titl=
e Fedora (2.6.31-rc6-enming.teo)<br>

=A0=A0=A0 root (hd0,0)<br>#=A0=A0=A0 kernel /vmlinuz-2.6.31-rc6-enming.teo =
ro root=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>#=
=A0=A0=A0 initrd /initrd-2.6.31-rc6-enming.teo.img<br>=A0=A0=A0 kernel /xen=
.gz dom0_mem=3D1024M iommu=3D1<br>

=A0=A0=A0 module /vmlinuz-2.6.31-rc6-enming.teo ro root=3D/dev/mapper/vg_fe=
dora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br>=A0=A0=A0 module /i=
nitrd-2.6.31-rc6-enming.teo.img<br>title Fedora (2.6.30-rc3-enming.teo-tip)=
<br>=A0=A0=A0 root (hd0,0)<br>

#=A0=A0=A0 kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=3D/dev/mapper/=
vg_fedora11_host-lv_root rhgb quiet selinux=3D0<br>#=A0=A0=A0 initrd /initr=
d-2.6.30-rc3-enming.teo-tip.img<br>=A0=A0=A0 kernel /xen.gz dom0_mem=3D1024=
M iommu=3D1<br>=A0=A0=A0 module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=
=3D/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=3D0 nomodeset<br=
>

=A0=A0=A0 module /initrd-2.6.30-rc3-enming.teo-tip.img<br>title Fedora (2.6=
.29.4-167.fc11.x86_64)<br>=A0=A0=A0 root (hd0,0)<br>=A0=A0=A0 kernel /vmlin=
uz-2.6.29.4-167.fc11.x86_64 ro root=3D/dev/mapper/vg_fedora11_host-lv_root =
rhgb quiet selinux=3D0<br>

=A0=A0=A0 initrd /initrd-2.6.29.4-167.fc11.x86_64.img<div class=3D"im"><br>=
<br>-- <br>Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mech=
anical Engineering)<br>Alma Maters:<br>(1) Singapore Polytechnic<br>(2) Nat=
ional University of Singapore<br>

My Primary Blog: <a href=3D"http://teo-en-ming-aka-zhang-enming.blogspot.co=
m" target=3D"_blank">http://teo-en-ming-aka-zhang-enming.blogspot.com</a><b=
r>My Secondary Blog: <a href=3D"http://enmingteo.wordpress.com" target=3D"_=
blank">http://enmingteo.wordpress.com</a><br>

My Youtube videos: <a href=3D"http://www.youtube.com/user/enmingteo" target=
=3D"_blank">http://www.youtube.com/user/enmingteo</a><br>Email: <a href=3D"=
mailto:space.time.universe@gmail.com" target=3D"_blank">space.time.universe=
@gmail.com</a><br>
Mobile Phone (Starhub Prepaid): +65-8369-2618<br>
Street: Bedok Reservoir Road<br>Country: Singapore<br><br></div><div><div><=
/div><div class=3D"h5"><div class=3D"gmail_quote">On Mon, Nov 9, 2009 at 8:=
18 PM, Pasi K=E4rkk=E4inen <span dir=3D"ltr">&lt;<a href=3D"mailto:pasik@ik=
i.fi" target=3D"_blank">pasik@iki.fi</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming (Zhang Enmin=
g) wrote:<br>
&gt; =A0 =A0What is a good value for dom0_mem if I want to start X server a=
nd run<br>
&gt; =A0 =A0GNOME? Will 512 MB be too little?<br>
&gt;<br>
<br>
</div>Go for 1024 MB then..<br>
<font color=3D"#888888"><br>
-- Pasi<br>
<br>
</font></blockquote></div><br><br clear=3D"all"><br><br>
</div></div></blockquote></div><br><br clear=3D"all"><br><br>

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