----- Messaggio originale -----
Da: "Eric Blake" <eblake@redhat.com> A: "Osier Yang" <jyang@redhat.com> Cc: libvir-list@redhat.com, pbonzini@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