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[Xen-devel] Re: how to congure dom0 to 1G, and domU to 1G

  • To: Pasi Kärkkäinen <pasik@xxxxxx>
  • From: lei yang <yanglei.fage@xxxxxxxxx>
  • Date: Thu, 20 May 2010 16:59:00 +0800
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Xen Mailing List <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 20 May 2010 02:00:31 -0700
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On Thu, May 20, 2010 at 2:04 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
On Thu, May 20, 2010 at 01:59:16PM +0800, lei yang wrote:
>    Hi Experts,

I removed xen-devel from CC since this is a very basic question,
and not related to Xen development.

>    I want to configure dom0 to 1g and dom0 to 1g ?
>    I know dom0_mem=1024M can do it for dom0, how about domU?

Uhm.. for domU you specify:

memory = 1024

in the domU configuration file (/etc/xen/<guest>).

>    My machine has 8 cores
>    how to  specify xen to 4 cpus?

Xen is the *hypervisor*, so it has to use ALL the physical CPUs/cores,
to be able to schedule vcpus!!

Do you mean we can't specify xen to 4 cpus, and if we specify "nosmp" what does it mean
it will use *just* one physical core to schedule vcpus? and dom0 and domU just can use one core?

>    how to specify dom0 4 cpus

dom0_max_vcpus=4 for xen.gz in grub.conf.
 Specified options "dom0_max_vcpus=2" and "dom0_vcpus_pin".
Specified option "dom0_max_vcpus=2".

what's the difference? which performance will be higher?


>    how to specify domU 5 cpus ?

vcpus = 5

>    can we specify dom0 to 1 cpu, at same time domU to 6 cpu

dom0_max_vcpus=1 dom0_vcpus_pin

in grub.conf for xen.gz.

>    can we specify nosmp to xen, and then specify dom0 cpu > 1?


See: http://wiki.xensource.com/xenwiki/XenBestPractices
and: http://wiki.xensource.com/xenwiki/XenCommonProblems

-- Pasi

>    Thanks
>    Lei
>    --
>    "We learn from failure, not from success!"

"We learn from failure, not from success!"
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