linux-kernel - Re: [patch] CFS scheduler, -v18

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Date:	Mon, 25 Jun 2007 09:27:20 +0200
From:	"Antonino Ingargiola" <tritemio@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v18

2007/6/24, Ingo Molnar <mingo@...e.hu>:
>
> * Antonino Ingargiola <tritemio@...il.com> wrote:
>
> > Anyway, I've discovered with great pleasure that CFS has also the
> > SCHED_ISO priority. I may have missed something, but I don't remember
> > to have read this in any of the CFS release notes :). For me this is a
> > really useful feature. Thanks.
>
> well, it's only a hack and emulated: SCHED_ISO in CFS is recognized as a
> policy but it falls back to SCHED_NORMAL. Could you check how well this
> (i.e. SCHED_NORMAL) works for your workload, compared to SD's SCHED_ISO?

To be fair, my workload is not really "critical". I'm used to
skip-free audio listening (no matter what) since long time running my
audio player with SCHED_ISO. Even in mainline the skips aren't so
frequent, but still annoying. I'm using SCHED_ISO for the confidence
it gives in providing skip-free audio.

For my modest needs also CFS SCHED_NORMAL has been just fine (in these
latest days). I'll report if I can find a more critical workload that
can possibly stress CFS SCHED_NORMAL.

Regards,

    ~ Antonio
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