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

On 06/26/2012 01:49 AM, Sridhar Samudrala wrote:

On 6/25/2012 2:16 AM, Jason Wang wrote:

quoted

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

quoted

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@vger.kernel.org/msg64111.html

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