[libvirt] Dependency between <vcpu> and <topology>
Hi, Is there a dependency b/n <vcpu> and <topology> ? Is specifying <vcpu> mandatory for a SMP guest ? Can't I skip <vcpu> but have <topology sockets= cores= threads=> to define a SMP guest ? 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 ? Regards, Bharata. -- http://bharata.sulekha.com/blog/posts.htm, http://raobharata.wordpress.com/
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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Bharata B Rao -
Eric Blake