linux-kernel - Re: SD scheduler testing hitch

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Message-Id: <1176019324.8244.6.camel@Homer.simpson.net>
Date:	Sun, 08 Apr 2007 10:02:04 +0200
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Con Kolivas <kernel@...ivas.org>
Subject: Re: SD scheduler testing hitch

On Sat, 2007-04-07 at 19:17 +0200, Mike Galbraith wrote:

> I lowered the time to 500us, and ran at nice -10.. it starves tenpercent
> here every time.  (ran as taskset -c 1 nice -n -10 ./fairtest)  The
> starving 10% duty cycle task has trouble getting 1% CPU.

Hmm.  Playing with it some more today, it still happens, but it's not
very repeatable.  Something is odd.  I wonder if any SD using readers
will try it.

	-Mike

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