Max. PV and HVM Guests

Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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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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Re: Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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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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Re: Max. PV and HVM Guests

[Moi meme]

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 à 19:45 +0800, Mr. Teo En Ming (Zhang
Enming) a écrit :
> 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

Re: Max. PV and HVM Guests

[Pasi Kärkkäinen]

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

Re: [Xen-devel] Max. PV and HVM Guests

[Grant McWilliams]

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On Sun, Nov 8, 2009 at 5:50 AM, Pasi Kärkkäinen <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.
> >
>

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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Re: [Xen-devel] Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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Yes. I will try to see if there's a traceback.

-- 
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 Kärkkäinen <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 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
>
>

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RE: [Xen-users] Max. PV and HVM Guests

[Robert Dunkley]

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 à 19:45 +0800, Mr. Teo En Ming (Zhang
Enming) a écrit :
> 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




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SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
Company Number: 06481952

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

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Re: Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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Hi,

Please watch this 4-minute video at
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?

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. 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 à 19:45 +0800, Mr. Teo En Ming (Zhang
> Enming) a écrit :
> > 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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Re: Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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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?

-- 
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=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?
>
> 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. 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 à 19:45 +0800, Mr. Teo En Ming (Zhang
>> Enming) a écrit :
>> > 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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_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Re: [Xen-devel] Re: Max. PV and HVM Guests

[Pasi Kärkkäinen]

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

Re: Re: [Xen-users] Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

[-- Attachment #1.1: Type: text/plain, Size: 2953 bytes --]

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=0xffff800000000000
xen_changeset          : Tue Sep 01 11:34:31 2009 +0100 20143:a7de5bd776ca
xen_commandline        : iommu=1
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)(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 Kärkkäinen <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=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
>
>
>

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

Re: Re: [Xen-users] Max. PV and HVM Guests

[Pasi Kärkkäinen]

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=512M 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      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=0xffff800000000000
>    xen_changeset          : Tue Sep 01 11:34:31 2009 +0100 20143:a7de5bd776ca
>    xen_commandline        : iommu=1
>    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)(Mechanical
>    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 Kärkkäinen <[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=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
> 
> 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=LbLaPpwNAx4

Re: Re: [Xen-users] Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

[-- Attachment #1.1: Type: text/plain, Size: 5225 bytes --]

What is a good value for dom0_mem if I want to start X server and run GNOME?
Will 512 MB be too little?

-- 
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 Kärkkäinen <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=512M 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      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=0xffff800000000000
> >    xen_changeset          : Tue Sep 01 11:34:31 2009 +0100
> 20143:a7de5bd776ca
> >    xen_commandline        : iommu=1
> >    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)(Mechanical
> >    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 Kärkkäinen <[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=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
> >
> > 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=LbLaPpwNAx4
>

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

Re: Re: [Xen-users] Max. PV and HVM Guests

[Pasi Kärkkäinen]

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

Re: Re: [Xen-users] Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

[-- Attachment #1.1: Type: text/plain, Size: 6094 bytes --]

Great! After setting dom0_mem=1024M, 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=/dev/mapper/vg_fedora11_host-lv_root
#          initrd /initrd-version.img
#boot=/dev/sda
default=4
timeout=100
splashimage=(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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.5-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.5-xen-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.4-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.4-xen-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.1-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.1-xen-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.18.8-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.18.8-enming.teo ro
root=/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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#       initrd /initrd-2.6.31-rc6-enming.teo.img
        kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1
com1=115200,8n1 console=com1
#       module /vmlinuz-2.6.31-rc6-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0
console=ttyS0,115200
    module /vmlinuz-2.6.31-rc6-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0
earlyprintk=xen
        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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#       initrd /initrd-2.6.30-rc3-enming.teo-tip.img
        kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1
com1=115200,8n1 console=com1
#       module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0
console=ttyS0,115200
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0
earlyprintk=xen
        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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31-rc6-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31-rc6-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.30-rc3-enming.teo-tip.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    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 Kärkkäinen <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 run
> >    GNOME? Will 512 MB be too little?
> >
>
> Go for 1024 MB then..
>
> -- Pasi
>
>

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Re: [Xen-devel] Re: Max. PV and HVM Guests

[Mr. Teo En Ming (Zhang Enming)]

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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-ops
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 sluggishness
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!

-- 
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=1024M, 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=/dev/mapper/vg_fedora11_host-lv_root
> #          initrd /initrd-version.img
> #boot=/dev/sda
> default=4
> timeout=100
> splashimage=(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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.31.5-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.31.5-xen-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.31.4-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.31.4-xen-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.31.1-xen-enming.teo.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.31.1-xen-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.18.8-enming.teo.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.18.8-enming.teo ro
> root=/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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #       initrd /initrd-2.6.31-rc6-enming.teo.img
>         kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1
> com1=115200,8n1 console=com1
> #       module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0
> console=ttyS0,115200
>     module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0
> earlyprintk=xen
>         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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #       initrd /initrd-2.6.30-rc3-enming.teo-tip.img
>         kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1
> com1=115200,8n1 console=com1
> #       module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0
> console=ttyS0,115200
>     module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0
> earlyprintk=xen
>         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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.31-rc6-enming.teo.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
> #    initrd /initrd-2.6.30-rc3-enming.teo-tip.img
>     kernel /xen.gz dom0_mem=1024M iommu=1
>     module /vmlinuz-2.6.30-rc3-enming.teo-tip ro
> root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
>     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=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
>     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 Kärkkäinen <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 run
>> >    GNOME? Will 512 MB be too little?
>> >
>>
>> Go for 1024 MB then..
>>
>> -- Pasi
>>
>>
>
>
>
>

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