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    Subjectx86 memcpy performance
    Hi All,
    Our Video recorder application uses memcpy for every frame. About 2KB
    data every frame on Intel® Atom™ Z5xx processor.
    With default 2.6.35 kernel we got 19.6 fps. But it seems kernel
    implemented memcpy is suboptimal, because when we replaced
    with an optmized one (using ssse3, exact patches are currently being
    finalized) ew obtained 22fps a gain of 12.2 %.
    C0 residency also reduced from 75% to 67%. This means power benefits too.
    My questions:
    1. Is kernel memcpy profiled for optimal performance.
    2. Does the default kernel configuration for i386 include the best
    memcpy implementation (AMD 3DNOW, __builtin_memcpy .... etc)

    Any suggestions, prior experience on this is welcome.

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      Last update: 2011-08-12 20:01    [W:0.018 / U:13.436 seconds]
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