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

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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

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