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    SubjectRe: tbench regression in 2.6.25-rc1
    On Mon, 18 Feb 2008 16:12:38 +0800, "Zhang, Yanmin" said:

    > I also think __refcnt is the key. I did a new testing by adding 2 unsigned long
    > pading before lastuse, so the 3 members are moved to next cache line. The performance is
    > recovered.
    > How about below patch? Almost all performance is recovered with the new patch.
    > Signed-off-by: Zhang Yanmin <>

    Could you add a comment someplace that says "refcnt wants to be on a different
    cache line from input/output/ops or performance tanks badly", to warn some
    future kernel hacker who starts adding new fields to the structure?
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      Last update: 2008-02-18 18:37    [W:0.036 / U:9.648 seconds]
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