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    SubjectO(1) scheduler gives big boost to tbench 192
    On an OSDL 4 way x86 box the O(1) scheduler effect 
    becomes obvious as the run queue gets large.

    2.4.19-pre7-ac2 and 2.4.19-pre7-jam6 have the O(1) scheduler.

    At 192 processes, O(1) shows about 340% improvement in throughput.
    The dyn-sched in -aa appears to be somewhat improved over the
    standard scheduler.

    Numbers are in MB/second.

    tbench 192 processes
    2.4.16 29.39
    2.4.17 29.70
    2.4.19-pre5 29.01
    2.4.19-pre5-aa1 29.22
    2.4.19-pre5-aa1-2g-hio 29.94
    2.4.19-pre5-aa1-3g-hio 28.66
    2.4.19-pre7 29.93
    2.4.19-pre7-aa1 32.75
    2.4.19-pre7-ac2 103.98
    2.4.19-pre7-rmap13 29.46
    2.4.19-pre7-jam6 104.98
    2.4.19-pre7-rl 29.74

    At 64 processes, O(1) helps a little. ac2 and jam6 have
    the highest numbers here too.

    tbench 64 processes
    2.4.16 101.99
    2.4.17 103.49
    2.4.19-pre5-aa1 102.43
    2.4.19-pre5-aa1-2g-hio 104.30
    2.4.19-pre5-aa1-3g-hio 104.60
    2.4.19-pre7 100.86
    2.4.19-pre7-aa1 101.76
    2.4.19-pre7-ac2 105.89
    2.4.19-pre7-rmap13 100.94
    2.4.19-pre7-rl 99.65
    2.4.19-pre7-jam6 108.23

    I've seen some benefit on a uniprocessor box running tbench 32
    for kernels with O(1). Hmm, have to try tbench 192 on uniproc
    and see if the difference is all scheduler overhead.

    I'm putting together a page with more results on this machine.
    It will be growing at:

    Randy Hron

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