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    SubjectRe: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
    On 11/09/2009 10:54 AM, Andi Kleen wrote:
    >> Ling's numbers didn't seem to show a significant slowdown on Core 2 (it
    >> was something like 0.95x baseline in the worst case, and most of the
    >> cases were positive) so Core 2 doesn't seem to have a problem.
    > I ran quite a lot of micro benchmarks with various alignments and sizes
    > the 'q' variant was not always a win. I haven't checked that particular
    > version though.

    Well, if you have concrete information about what the problem cases are,
    then please provide it. If you don't, but have a hunch where these
    potential problems may lie, then please indicate what they might be.
    Otherwise, there isn't any actionable information here.


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