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    SubjectRe: [RFC] IO scheduler based IO controller V6
    Vivek Goyal wrote:
    > On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote:
    >> Hi,
    >>
    >> Here are some fio test results for IO Controller V6 built and not built.
    >> Iozone test results are also attached.
    >>
    >
    > Hi Gui,
    >
    > Thanks a lot for some performance numbers. It seems to be a mixed chart.
    > Performance gains at some places and loss at others. I am curious about
    > that -7.0% for normal writes. Not sure what can contribute to that.
    >
    > What was the value of "fairness" parameter when you ran those tests? Can you
    > please set fairness = 0 and re-run the tests (if you have already not done so).
    >
    > By default fairness is set to 1 in V6. With fairness = 0, we should be very
    > close to existing CFQ behavior. If not, then we need to dive deeper and
    > see why variations are happening.

    Hi Vivek,

    I tested with default fairness value, i'll re-test it when fairness is set to 0.

    >
    > Is it also possible to run the same tests with V7.

    Sure.

    --
    Regards
    Gui Jianfeng

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