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Re: [libvirt] Dependency between <vcpu> and <topology>



On 09/15/2011 11:50 PM, Bharata B Rao wrote:
Hi,

Is there a dependency b/n<vcpu>  and<topology>  ?

There should be, but isn't yet.


Is specifying<vcpu>  mandatory for a SMP guest ?

No.


Can't I skip<vcpu>  but have<topology sockets= cores= threads=>  to
define a SMP guest ?

It should be possible, but isn't yet.


I see that if I skip<vcpu>, libvirt generates -smp 1 on qemu command
line which results in qemu booting a VM with single CPU irrespective
of the topology specified. Shouldn't libvirt arrive at correct CPU
count (vcpus=sockets*cores*threads ?) even if vcpu isn't specified
rather than defaulting to 1 ?

See also these bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=725269
https://bugzilla.redhat.com/show_bug.cgi?id=725271

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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