Date: Tue, 23 Mar 2004 10:23:40 +0100
From: Pavel Machek <pavel@suse.cz>
To: Kurt Garloff <garloff@suse.de>,
       Linux kernel list <linux-kernel@vger.kernel.org>
Subject: Re: dynamic sched timeslices
Message-ID: <20040323092340.GD1505@openzaurus.ucw.cz>
References: <20040315224201.GX4452@tpkurt.garloff.de>
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Hi!

> attached patch allows userspace to tune the scheduling timeslices.
> It can be used for a couple of things:
> * Tune a workload for batch processing:
>   You'd probably wnat to use long timeslices in order to not reschedule
>   as often to make good use of your CPU caches
> * Tune a workload for interactive use:
>   Under load, you may want to reduce the scedulilng latencies by using
>   shorter timeslices (and there are situations where the interactiviy
>   tweak -- even if they were perfect -- can't save you).
> * Tune the ration betweeen maximum and minimum timeslices to make
>   nice much nicer e.g.

If you make ration much bigger, you are going to see
priority inversion issues. Some kind of "boost priority when in
kernel" would be needed...

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