Re: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify

Avi Kivity
2010-11-14T12:19:38Z

On 11/14/2010 01:05 PM, Avi Kivity wrote:
>> I agree, but let's enable virtio-ioeventfd carefully because bad code
>> is out there.
>
>
> Sure. Note as long as the thread waiting on ioeventfd doesn't consume
> too much cpu, it will awaken quickly and we won't have the
> "transaction per timeslice" effect.
>
> btw, what about virtio-blk with linux-aio? Have you benchmarked that
> with and without ioeventfd?
>

And, what about efficiency? As in bits/cycle?

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