Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

Avi Kivity
2009-12-23T12:48:35Z

On 12/23/2009 02:14 PM, Andi Kleen wrote:
>> http://www.redhat.com/f/pdf/summit/cwright_11_open_source_virt.pdf
>>
>> See slide 32. This is without vhost-net.
>>
> Thanks. Do you also have latency numbers?
>

No. Copying Chris. This was with the tx mitigation timer disabled, so
you won't see the usual atrocious userspace virtio latencies, but it
won't be as good as a host kernel implementation since we take a
heavyweight exit and qemu is pretty unoptimized.

> It seems like there's definitely still potential for improvement
> with messages<4K. But for the large messages they indeed
> look rather good.
>

There's still a lot of optimization to be done, but I hope this proves
there is nothing inherently slow about virtio.

--
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