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    SubjectRe: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest
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    >On Sun, Nov 10 2002, Con Kolivas wrote:
    >> >On Sat, Nov 09 2002, Con Kolivas wrote:
    >> >> >You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1.
    >> >> >Maybe it doesn't translate to worsened interactivity. Needs more
    >> >> >testing and anaysis.
    >> >>
    >> >> Sounds fair enough. My resources are exhausted though. Someone else
    >> >> have any thoughts?
    >> >
    >> >Try setting lower elevator passover values. Something ala
    >> >
    >> ># elvtune -r 64 /dev/hda
    >> >
    >> >(or whatever your drive is)
    >>

    >> That's it then. Should I run a family of different values and if so
    >> over what range?
    >
    >The default is 2048. How long does the io_load test take, or rather how
    >many tests are appropriate to do? To get a good picture of how it looks
    >you should probably try: 0, 8, 16, 64, 128, 512. Once you get some of
    >these results, it will be easier to determine which area(s) would be
    >most interesting to further explore.

    The io_load test takes as long as the time in seconds shown on the table. At
    least 3 tests are appropriate to get a reasonable average [runs is in square
    parentheses]. Therefore it takes about half an hour per run. Luckily I had
    the benefit of a night to set up a whole lot of runs:

    io_load:
    Kernel [runs] Time CPU% Loads LCPU% Ratio
    2420rc1r0 [3] 489.3 15 36 10 6.85
    2420rc1r8 [3] 485.5 15 35 10 6.80
    2420rc1r16 [3] 570.4 12 43 10 7.99
    2420rc1r32 [3] 570.1 12 42 10 7.98
    2420rc1r64 [3] 575.0 12 43 10 8.05
    2420rc1r128 [3] 611.4 11 46 10 8.56
    2420rc1r256 [3] 646.2 11 49 10 9.05
    2420rc1r512 [3] 603.7 12 45 10 8.46
    2420rc1r1024 [3] 693.9 10 53 10 9.72
    2.4.20-rc1 [2] 1142.2 6 90 10 16.00

    Test hardware is 1133Mhz P3 laptop with 5400rpm ATA100 drive. I don't doubt
    the response curve would be different for other hardware.

    Con
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