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    SubjectRe: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel
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    On Tue, 2010-09-14 at 18:29 +0200, Michael S. Tsirkin wrote:
    > Precisely. This is what the patch from Xin Xiaohui does. That code
    > already seems to do most of what you are trying to do, right?

    I thought host pins guest kernel buffer pages was good enough for TX
    thought I didn't look up xiaohui's vhost asycn io patch in details.

    What's the performance data Xiaohui got from using kiocb? I haven't seen
    any performance number from him yet.

    > The main thing missing seems to be macvtap integration, so that we can
    > fall back
    > on data copy if zero copy is unavailable?
    > How hard would it be to basically link the mp and macvtap modules
    > together to get us this functionality? Anyone?

    The simple integration is using macvtap + xiaohui's vhost asycn io
    patch. I can make a try for TX only.

    Thanks
    Shirley



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