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

[lei yang <yanglei.fage@xxxxxxxxx>]

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?


Thanks
Lei

>    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?
>

No.

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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