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?
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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