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Message-ID: <20070829080417.GB19386@elte.hu>
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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