linux-kernel - Re: CFS review

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Message-ID: <20070829034542.GA32164@elte.hu>
Date:	Wed, 29 Aug 2007 05:45:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Bill Davidsen <davidsen@....com>
Cc:	Al Boldi <a1426z@...ab.com>, 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


* Bill Davidsen <davidsen@....com> wrote:

> > There is another way to show the problem visually under X 
> > (vesa-driver), by starting 3 gears simultaneously, which after 
> > laying them out side-by-side need some settling time before 
> > smoothing out.  Without __update_curr it's absolutely smooth from 
> > the start.
> 
> I posted a LOT of stuff using the glitch1 script, and finally found a 
> set of tuning values which make the test script run smooth. See back 
> posts, I don't have them here.

but you have real 3D hw and DRI enabled, correct? In that case X uses up 
almost no CPU time and glxgears makes most of the processing. That is 
quite different from the above software-rendering case, where X spends 
most of the CPU time.

	Ingo
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