linux-kernel - Re: CFS review

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Message-Id: <1188287015.1131.232.camel@frg-rhel40-em64t-04>
Date:	Tue, 28 Aug 2007 09:43:35 +0200
From:	Xavier Bestel <xavier.bestel@...e.fr>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review

On Tue, 2007-08-28 at 07:37 +0300, Al Boldi wrote:
> start gears like this:
> 
>   # gears & gears & gears &
> 
> Then lay them out side by side to see the periodic stallings for
> ~10sec.

Are you sure they are stalled ? What you may have is simple gears
running at a multiple of your screen refresh rate, so they only appear
stalled.

Plus, as said Linus, you're not really testing the kernel scheduler.
gears is really bad benchmark, it should die.

	Xav


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