Re: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net

[Jason Wang]

On 06/26/2012 01:49 AM, Sridhar Samudrala wrote:
> On 6/25/2012 2:16 AM, Jason Wang wrote:
> > Hello All:
> >
> > This series is an update version of multiqueue virtio-net driver 
> > based on
> > Krishna Kumar's work to let virtio-net use multiple rx/tx queues to 
> > do the
> > packets reception and transmission. Please review and comments.
> >
> > Test Environment:
> > - Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, 8 cores 2 numa nodes
> > - Two directed connected 82599
> >
> > Test Summary:
> >
> > - Highlights: huge improvements on TCP_RR test
> > - Lowlights: regression on small packet transmission, higher cpu 
> > utilization
> >               than single queue, need further optimization
> Does this also scale with increased number of VMs?

Hi Sridhar:

Good suggestions, I didn't measure them. I would run test and post them.

Thanks

> Thanks
> Sridhar
> > Analysis of the performance result:
> >
> > - I count the number of packets sending/receiving during the test, and
> >    multiqueue show much more ability in terms of packets per second.
> >
> > - For the tx regression, multiqueue send about 1-2 times of more packets
> >    compared to single queue, and the packets size were much smaller 
> > than single
> >    queue does. I suspect tcp does less batching in multiqueue, so I 
> > hack the
> >    tcp_write_xmit() to forece more batching, multiqueue works as well as
> >    singlequeue for both small transmission and throughput
> >
> > - I didn't pack the accelerate RFS with virtio-net in this sereis as 
> > it still
> >    need further shaping, for the one that interested in this please see:
> >    http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg64111.html
>
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