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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 re-run the fio test under V6 for normal reads and writes with fairness == 0.
    It seems the performance gets a little better for normal writes than before.


    Mode Normal read | Random read | Normal write | Random write
    2.6.31-rc1 53,547KiB/s 2,894KiB/s 44,088KiB/s 8,450KiB/s

    V6(fairness = 0) 53,199KiB/s 2,847KiB/s 41,898KiB/s 8,582KiB/s

    Performance 0% -1.6% -4.9% +1.5%

    >
    > Is it also possible to run the same tests with V7.
    >
    > Thanks
    > Vivek
    >
    >> Arch: X86
    >> Mem: 1G
    >> Disk: 320G
    >> IO Scheduler: CFQ
    >>
    >> ============
    >> By normal read and write syscall.
    >>
    >> Block Size:32K
    >> File Size: 1G * 10
    >>
    >> Mode Normal read | Random read | Normal write | Random write | Direct read | Direct write
    >>
    >> 2.6.31-rc1 47,932KiB/s 3,566KiB/s 45,693KiB/s 8,501KiB/s 50,088KiB/s 43,473KiB/s
    >>
    >> 2.6.31-rc1-Vivek-V6 47,231KiB/s 3,411KiB/s 42,451KiB/s 8,714KiB/s 51,284KiB/s 42,341KiB/s
    >>
    >> Performance -1.5% -4.4% -7.0% +2.5% +2.4% -2.6%
    >>
    >> ============
    >>
    >> By mmap.
    >>
    >> Block Size:32K
    >> File Size: 500M
    >>
    >> Mode Normal read | Random read | Normal write | Random write
    >>
    >> 2.6.31-rc1 49,951KiB/s 3,245KiB/s 21,950KiB/s 2,771KiB/s
    >>
    >> 2.6.31-rc1-Vivek-V6 49,951KiB/s 3,154KiB/s 22,593KiB/s 2,648KiB/s
    >>
    >> Performance 0% -2.8% +2.9% -4.4%
    >>
    >> ============
    >>
    >> By libaio calls
    >>
    >> Block Size:32K
    >> File Size: 500M
    >>
    >> Mode Normal read | Random read | Normal write | Random write
    >>
    >> 2.6.31-rc1 49,447KiB/s 3,296KiB/s 57,519KiB/s 21,093KiB/s
    >>
    >> 2.6.31-rc1-Vivek-V6 50,142KiB/s 3,238KiB/s 57,791KiB/s 21,283KiB/s
    >>
    >> Performance +1.4% -1.8% 0% +0.1%
    >>
    >> ============
    >>
    >>
    >>
    >>
    >>
    >>
    >>
    >>
    >>
    >>
    >>
    >
    >
    >
    >
    >
    >

    --
    Regards
    Gui Jianfeng


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