Re: [patch] sched-2.6.0-test1-G3, interactivity changes, audio latency

From: Ingo Molnar (mingo_at_elte.hu)
Date: 07/27/03

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    Date:	Sun, 27 Jul 2003 12:26:56 +0200 (CEST)
To: Guillaume Chazarain <gfc@altern.org>

    On Sat, 26 Jul 2003, Guillaume Chazarain wrote:

    > BTW, with your nanosecond resolution, mplayer is also max interactive.

    good.

    > Don't you find it strange to need a nanosecond resolution to evaluate a
    > simple integer in a [-5, 5] range?

    no, i dont find it strange, as the -5..5 integer range is only the end
    result. What we really want is an accurate sleep average, the integral of
    sleep times done over the last N seconds. Given that tasks can schedule at
    very high frequencies these days, this needs accurate measurements. I used
    to hope that a 1 msec sampling frequency would to be enough for this, but
    when we fix the statistics cornercase you mention, another cornercase pops
    up. And it's not _that_ hard to use the cycle counter and still have a
    reasonably fast algorithm, anyway.

            Ingo

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