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    SubjectRe: 2.6.9-rc3-mm3: vm-thrashing-control-tuning
    Hideo AOKI <aoki@sdl.hitachi.co.jp> wrote:
    >
    > Since I made the patch for 2.6.9-rc3, the patch caused trouble
    > to sysctl code in -mm tree.
    >
    > Attached patch fixes this issue.

    Thanks.

    Have you been doing any performance measurements on the thrash-control
    code?

    I went back to my original notes from when the patch was first being tested and
    I had:

    mem=256m, without, ./qsbench -p 4 -m 96

    ./qsbench -p 4 -m 96 27.50s user 3.92s system 9% cpu 5:34.26 total
    ./qsbench -p 4 -m 96 27.77s user 4.19s system 9% cpu 5:41.38 total
    ./qsbench -p 4 -m 96 27.22s user 4.17s system 9% cpu 5:16.75 total

    with:

    ./qsbench -p 4 -m 96 27.40s user 2.08s system 35% cpu 1:23.67 total
    ./qsbench -p 4 -m 96 27.70s user 2.14s system 30% cpu 1:38.92 total
    ./qsbench -p 4 -m 96 27.03s user 1.79s system 39% cpu 1:13.16 total


    But now I am unable to get anything remotely near the 1-2 minute runtimes
    with this workload on current kernels. Which means that either we broke it
    again or I originally mismeasured it somehow.

    I'm wondering if you've been able to notice any performance improvements
    from the thrashing control and if so, how much and on what workload?
    -
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