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    SubjectRe: [PATCH] O6int for interactivity


    Mike Galbraith wrote:

    > At 03:12 PM 7/16/2003 -0700, Davide Libenzi wrote:
    >
    >> http://www.xmailserver.org/linux-patches/irman2.c
    >>
    >> and run it with different -n (number of tasks) and -b (CPU burn ms
    >> time).
    >> At the same time try to build a kernel for example. Then you will
    >> realize
    >> that interactivity is not the bigger problem that the scheduler has
    >> right
    >> now.
    >
    >
    > I added an irman2 load to contest. Con's changes 06+06.1 stomped it
    > flat [1]. irman2 is modified to run for 30s at a time, but with
    > default parameters.
    >
    > -Mike
    >
    > [1] imho a little too flat. it also made a worrisome impression on
    > apache bench
    >
    >
    >------------------------------------------------------------------------
    >
    >no_load:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 153 94.8 0.0 0.0 1.00
    >2.5.70 1 153 94.1 0.0 0.0 1.00
    >2.6.0-test1 1 153 94.1 0.0 0.0 1.00
    >2.6.0-test1-mm1 1 152 94.7 0.0 0.0 1.00
    >cacherun:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 146 98.6 0.0 0.0 0.95
    >2.5.70 1 146 98.6 0.0 0.0 0.95
    >2.6.0-test1 1 146 98.6 0.0 0.0 0.95
    >2.6.0-test1-mm1 1 146 98.6 0.0 0.0 0.96
    >process_load:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 331 43.8 90.0 55.3 2.16
    >2.5.70 1 199 72.4 27.0 25.5 1.30
    >2.6.0-test1 1 264 54.5 61.0 44.3 1.73
    >2.6.0-test1-mm1 1 323 44.9 88.0 54.2 2.12
    >ctar_load:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 190 77.9 0.0 0.0 1.24
    >2.5.70 1 186 80.1 0.0 0.0 1.22
    >2.6.0-test1 1 213 70.4 0.0 0.0 1.39
    >2.6.0-test1-mm1 1 207 72.5 0.0 0.0 1.36
    >xtar_load:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 196 75.0 0.0 3.1 1.28
    >2.5.70 1 195 75.9 0.0 3.1 1.27
    >2.6.0-test1 1 193 76.7 1.0 4.1 1.26
    >2.6.0-test1-mm1 1 195 75.9 1.0 4.1 1.28
    >io_load:
    >Kernel [runs] Time CPU% Loads LCPU% Ratio
    >2.5.69 1 437 34.6 69.1 15.1 2.86
    >2.5.70 1 401 37.7 72.3 17.4 2.62
    >2.6.0-test1 1 243 61.3 48.1 17.3 1.59
    >2.6.0-test1-mm1 1 336 44.9 64.5 17.3 2.21
    >

    Looks like gcc is getting less priority after a read completes.
    Keep an eye on this please.


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