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    SubjectRe: zero-copy TCP

    On Mon, 4 Sep 2000 wrote:

    > The experiment showed the following prefetching could reduce 20-30% of
    > csum_partial_copy_generic() execution time.

    Please test it and post the numbers. csum_partial_copy_generic() already
    does prefetching - the real test would be to check lat_tcp and bw_tcp
    numbers over gigabit, with and without this patch applied. (the same
    numbers over localhost dont really count.) Eg. we had smart KNI-based
    memcpy routines as well, and it turned out that bw_tcp over gigabit
    actually got slower. [testing over 100mbit isnt enough obviously because
    x86 CPUs csum much faster than that.]


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