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    SubjectRe: [PATCH 3/6] writeback: sync expired inodes first in background writeback
    On Wed, Apr 20, 2011 at 03:38:22PM +0800, Wu Fengguang wrote:
    > > make. Please test against a vanilla kernel if that is what you are
    > > aiming these patches for. If you aren't aiming for a vanilla kernel,
    > > please say so in the patch series header...
    >
    > Here are the test results for vanilla kernel. It's again shows better
    > numbers for dd, tar and overall run time.
    >
    > 2.6.39-rc3 2.6.39-rc3-dyn-expire+
    > ------------------------------------------------
    > all elapsed 256.043 252.367
    > stddev 24.381 12.530
    >
    > tar elapsed 30.097 28.808
    > dd elapsed 13.214 11.782

    The big reduction in run-to-run variance is very convincing - moreso
    than the reduction in runtime - That's kind of what I had hoped
    would occur once I understood the implications of the change. Thanks
    for running the test to close the loop. :)

    Cheers,

    Dave.
    --
    Dave Chinner
    david@fromorbit.com


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