Re: 2.5.74-mm1

From: Davide Libenzi (
Date: Sat Jul 05 2003 - 21:29:48 EST

On Sun, 6 Jul 2003, Diego Calleja [ISO-8859-15] García wrote:

> El Sat, 5 Jul 2003 23:09:12 +0200 Daniel Phillips <>
> escribió:
> > The "better" mechanism for sound scheduling is SCHED_RR, which requires
> > root privilege for some reason that isn't clear to me. Or maybe there
> > once was a good reason, back in the days of the dinosaurs.
> I don't think mp3 playing needs nothing special.
> Mp3 decoding on today's computers taks insignificant amounts of cpu time.
> Having mp3 skips even in light loads in a 2x800 box seems just
> unacceptable.

It is not a problem of CPU time spent, it is a timing problem. Many sound
players do use to feed the sound card with write()s that are typically
8-16Kb and it is sufficent 100-200ms of CPU black-out (at 44100 16bit) to
have a buffer under-run and an audio skip.

- Davide

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