Re: [libvirt] [PATCH] qemu: Support multiple queue virtio-scsi
----- Messaggio originale -----
Da: "Eric Blake" <eblake(a)redhat.com>
A: "Osier Yang" <jyang(a)redhat.com>
Cc: libvir-list(a)redhat.com, pbonzini(a)redhat.com
Inviato: Lunedì, 1 aprile 2013 18:43:11
Oggetto: Re: [libvirt] [PATCH] qemu: Support multiple queue virtio-scsi
On 04/01/2013 10:31 AM, Osier Yang wrote:
> No, multiple queue is not enabled by default. For "what happens if it
> doesn't match the number of vcpus", honestly, I'm not sure about it,
> my understanding is it doesn't have to match. But matching will have
> the best performance, and with this thought I think an attribute allows
> the user to specify the number makes sense instead of a boolean
> attribute. @paolo, can you confirm or deny this?
Then maybe all we need is just a recommendation that matching the number
of vcpus tends to give best performance, but not stating that it is
mandatory to match.
I think in the current patches anything that doesn't exactly matches
the number of VCPUs will fallback to single-queue. But it doesn't have
to be the case, so a numeric attribute is preferrable.
Paolo