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    SubjectRe: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel
    On Tue, Sep 14, 2010 at 12:36:23PM -0700, Shirley Ma wrote:
    > On Tue, 2010-09-14 at 21:01 +0200, Michael S. Tsirkin wrote:
    > > > > I think that you should be able to simply combine
    > > > > the two drivers together, add an ioctl to
    > > > > enable/disable zero copy mode of operation.
    > > >
    > > > That could work. But what's the purpose to have two drivers if one
    > > > driver can handle it?
    > > >
    > > > Thanks
    > > > Shirley
    > >
    > > This was just an idea: I thought it's a good way for people interested
    > > in this zero copy thing to combine forces and avoid making
    > > the same mistakes, but it's not a must of course.
    >
    > Ok, I will make a simple patch by reusing Xiaohui's some vhost code on
    > handling vhost_add_used_and_signal() to see any performance changes.
    >
    > The interesting thing here when I run 32 instances netperf/netserver I
    > didn't see any issue w/i this patch.
    >
    > Thanks
    > Shirley

    Yes, I agree this patch is useful for demo purposes:
    simple, and shows what kind of performance gains
    we can expect for TX.

    --
    MST


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