Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead

[Michael S. Tsirkin]

On Fri, Nov 02, 2012 at 11:18:18AM +0100, Stefan Hajnoczi wrote:
> On Thu, Nov 1, 2012 at 5:07 PM, Michael S. Tsirkin <address@hidden> wrote:
> > Commit 0d8d7690850eb0cf2b2b60933cf47669a6b6f18f introduced
> > a regression in virtio-net performance because it looks
> > into the ring aggressively while we really only care
> > about a single packet worth of buffers.
> > To fix, add parameters limiting lookahead, and
> > use in virtqueue_avail_bytes.
> >
> > Signed-off-by: Michael S. Tsirkin <address@hidden>
> > Reported-by: Edivaldo de Araujo Pereira <address@hidden>
> 
> Nice, much simpler than the ideas I had.
> 
> Reviewed-by: Stefan Hajnoczi <address@hidden>

Anthony could you apply this out of band please so this stops
biting people?

Thanks,
MST