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    SubjectRe: problem with "sched: revert back to per-rq vruntime"?
    Here's some times using bash, for example. Let me know if there are some 
    other tests I can do.

    It shows on vanilla 2.6.28, a huge increase in latency (about 37X to
    39X) starting bash -i when the CPU is loaded with 100% nice tasks,
    relative to idle CPU. But after reverting
    f9c0b0950d5fd8c8c5af39bc061f27ea8fddcac3 the latency increase is not as
    great (about 2X).

    # running bash -i on vanilla 2.6.28,
    # with idle CPU
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.020s
    user 0m0.008s
    sys 0m0.014s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.020s
    user 0m0.014s
    sys 0m0.005s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.020s
    user 0m0.008s
    sys 0m0.009s



    # running bash -i on vanilla 2.6.28,
    # with 100% nice CPU usage
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.753s
    user 0m0.011s
    sys 0m0.011s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.752s
    user 0m0.012s
    sys 0m0.012s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.786s
    user 0m0.010s
    sys 0m0.008s



    # running 2.6.28 reverted f9c0b0950d5fd8c8c5af39bc061f27ea8fddcac3,
    # with idle CPU
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.021s
    user 0m0.012s
    sys 0m0.007s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.020s
    user 0m0.012s
    sys 0m0.011s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.020s
    user 0m0.011s
    sys 0m0.012s



    # running 2.6.28 reverted f9c0b0950d5fd8c8c5af39bc061f27ea8fddcac3,
    # with 100% nice CPU usage
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.043s
    user 0m0.010s
    sys 0m0.009s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.046s
    user 0m0.011s
    sys 0m0.007s
    [jayson@atlas tmp]$ time bash -i -c 'exit'
    exit

    real 0m0.047s
    user 0m0.011s
    sys 0m0.006s




    Jayson



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