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    SubjectRe: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net
    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@vger.kernel.org/msg64111.html
    >
    >



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