Subject: Re: [linux-audio-dev] SCHED_FIFO versus SCHED_RR
From: dave willis (dubson_AT_dhammanet.net)
Date: Tue Nov 27 2001 - 01:25:25 EET
On Mon, 26 Nov 2001, Phil Burk wrote:
> I have heard reports that SCHED_FIFO has several bugs. I have searched the
> web and read many posts about this but there are still unanswered questions.
>
> Q: Does SCHED_RR work better than SCHED_FIFO? Fewer bugs?
i just read that SCHED_FIFO was discovered broken in 2.4.15, but i use
2.4.12(-ac3-pe) and it works (as well as earlier 2.4 kernels).
i've read somewhere that SCHED_RR has more bugs than SCHED_FIFO.
does anyone know if other unixes can use SCHED_FIFO with non-superuser
privileges?
> Q: Can I safely use the value from sched_get_priority_max(SCHED_FIFO) or
> should I use less?
i don't know much more than the sched_setscheduler man-page and my results
in using SCHED_FIFO, but the latencytest program uses
sched_get_priority_max(SCHED_FIFO) [ = 99 ], pd seems to use 98 for the
child and 96 for the parent, and jmax uses 96 for watchdog_low, 98 for
watchdog_high, and 97 for fts.
-dave
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