Re: [Qemu-devel] [question] virtio-blk performance degradationhappened with virito-serial

Paolo Bonzini
2014-09-01T13:12:50Z

Il 01/09/2014 15:09, Christian Borntraeger ha scritto:
> This is just wild guessing:
> If virtio-blk and virtio-serial share an IRQ, the guest operating system has to check each virtqueue for activity. Maybe there is some inefficiency doing that.
> AFAIK virtio-serial registers 64 virtqueues (on 31 ports + console) even if everything is unused.

That could be the case if MSI is disabled.

Paolo