Re: Max. PV and HVM Guests

["Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>]

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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
>>
>>
>>
>>
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>
>
>
>

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