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    SubjectRe: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net
    On 6/25/2012 3:07 AM, Michael S. Tsirkin wrote:
    > On Mon, Jun 25, 2012 at 05:16:48PM +0800, 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
    >
    > Didn't review yet, reacting this this paragraph:
    >
    > To avoid regressions, it seems reasonable to make
    > the device use a single queue by default for now.
    > Add a way to switch multiqueue on/off using ethtool.
    >
    > This way guest admin can tune the device for the
    > workload manually until we manage to imlement some
    > self-tuning heuristics.
    >

    Ethtool already has this switch 'ethtool -L' can be
    used to set the number tx/rx channels. So you would
    likely just need to add a set_channels hook.

    .John


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