linux-kernel - Re: changing timeslice in linux

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Message-ID: <1345442050.25011.38.camel@marge.simpson.net>
Date:	Mon, 20 Aug 2012 07:54:10 +0200
From:	Mike Galbraith <efault@....de>
To:	Xin Tong <xerox.time.tech@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: changing timeslice in linux

On Sun, 2012-08-19 at 11:58 -0700, Xin Tong wrote: 
> I have 2 questions about linux 2.6 x86_64 scheduler.
> 
> 1. is the default scheduling algorithm SCHED_NORMAL in linux ?

Yes.

> 2. how do i change the time slice in linux source code ?

You shouldn't need to.  You can tune "slice" by adjusting
sched_latency_ns and sched_min_granularity_ns, but note that "slice" is
not a fixed quantum.  Also note that CFS preemption decisions are based
upon instantaneous state.  A task may have received a full (variable)
"slice" of CPU time, but preemption will be triggered only if a more
deserving task is available, so a "slice" is not the "max uninterrupted
CPU time" that you may expect it to be.. but it is somewhat similar.

-Mike

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