[libvirt-users] Setting CPU type for a vm
Mauricio Tavares
raubvogel at gmail.com
Tue Jul 24 17:11:00 UTC 2012
On Thu, Jul 19, 2012 at 10:01 AM, Daniel P. Berrange
<berrange at redhat.com> wrote:
> On Thu, Jul 19, 2012 at 07:54:49AM -0600, Eric Blake wrote:
>> On 07/18/2012 08:45 PM, Mauricio Tavares wrote:
>> > I have a Windows XP vm and would like to know how should I set its
>> > cpu so it is seen by the vm as a proper 32bit one. In its xml file, I have
>> >
>> > <os>
>> > <type arch='i686' machine='rhel6.2.0'>hvm</type>
>>
>> That's the correct way.
>>
>> > and this is what virsh thinks my vm has:
>> >
>> > [root at vmhost ~]# virsh vcpuinfo xp
>> > VCPU: 0
>>
>> This looks like a bug - a guest cannot exist without at least one vcpu.
>>
>> > CPU: 2
>>
>> That only says your host has 2 cpus that the guest can utilize; it says
>> nothing about what type of cpu the guest will see.
>
> You're mis-interpreting the data here. 'vpucinfo' info repeats these
> four lines of data per VCPU.
>
> So this is saying that the first vCPU, #0, is running running on host
> CPU #2.
>
> The total number of guest CPUs is shown by 'virsh dominfo'
>
> The total number of host CPUs is shown by 'virsh nodeinfo'
>
Cool. I do take I can specify which cpu I want to use, right?
later on I need to read up on how to scale up the number of CPUs given
to a vm based on its load.
> Daniel
> --
> |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
> |: http://libvirt.org -o- http://virt-manager.org :|
> |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
> |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
More information about the libvirt-users
mailing list