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

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Message-ID: <20070624110746.GA28868@elte.hu>
Date:	Sun, 24 Jun 2007 13:07:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Antonino Ingargiola <tritemio@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v18

* 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? 
If you'd like to increase the priority of a task, i'd suggest to use 
negative nice levels. (use the 'nice' option in 
/etc/security/limits.conf with a newer version of PAM to allow 
unprivileged users to use negative nice levels.)

	Ingo
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