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    SubjectRe: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
    On Mon 2009-11-09 15:24:03, Ma, Ling wrote:
    > Hi All
    >
    > Today we run our benchmark on Core2 and Sandy Bridge:
    >
    > 1. Retrieve result on Core2
    > Speedup on Core2
    > Len Alignement Speedup
    > 1024, 0/ 0: 0.95x
    > 2048, 0/ 0: 1.03x

    Well, so you are running cache hot and it is only a win on huge
    copies... how common are those?

    > Application run through perf
    > For (i= 1024; i < 1024 * 16; i = i + 64)
    > do_memcpy(0, 0, i);

    Pavel

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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