linux-kernel - Re: CFS review

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Date:	Wed, 29 Aug 2007 10:04:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Keith Packard <keith.packard@...el.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


* Keith Packard <keith.packard@...el.com> wrote:

> Make sure the X server isn't running with the smart scheduler 
> disabled; that will cause precisely the symptoms you're seeing here. 
> In the normal usptream sources, you'd have to use '-dumbSched' as an X 
> server command line option.
> 
> The old 'scheduler' would run an entire X client's input buffer dry 
> before looking for requests from another client. Because glxgears 
> requests are small but time consuming, this can cause very long delays 
> between client switching.

on the old box where i've reproduced this i've got an ancient X version:

  neptune:~> X -version

  X Window System Version 6.8.2
  Release Date: 9 February 2005
  X Protocol Version 11, Revision 0, Release 6.8.2
  Build Operating System: Linux 2.6.9-22.ELsmp i686 [ELF]

is that old enough to not have the smart X scheduler?

on newer systems i dont see correctly updated glxgears output (probably 
the GLX bug you mentioned) so i cannot reproduce the bug.

Al, could you send us your 'X -version' output?

	Ingo
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