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

Christian Borntraeger
2014-09-01T13:22:40Z

On 01/09/14 15:12, Paolo Bonzini wrote:
> 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
>

Do the windows virtio drivers enable MSIs, in their inf file?

Christian