linux-kernel - Re: [patch/backport] CFS scheduler, -v22, for v2.6.23-rc8, v2.6.22.8, v2.6.21.7, v2.6.20.20

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Date:	Sun, 30 Sep 2007 17:26:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alejandro Riveira Fernández 
	<ariveira@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch/backport] CFS scheduler, -v22, for v2.6.23-rc8,
	v2.6.22.8, v2.6.21.7, v2.6.20.20


* Alejandro Riveira Fernández <ariveira@...il.com> wrote:

> > Even if CFS v20.5 worked well for you, please try this release too, with 
> > a good focus on interactivity testing - because, unless some major 
> > showstopper is found, this codebase is intended for a v2.6.24 upstream 
> > merge.
> > 
> > ( Even a quick, subjective report of: "checked this patch, it didnt
> >   crash and it feels like v20.5" or "laggier than v20.5" or "feels 
> >   better than v20.5" is useful to us and enables us to judge the general 
> >   direction of interactivity. )
> 
>  I feel it better than 20.5 but the later is more stable. Let me 
>  explain.
> 
>  I patched a 2.6.22.9 kernel with both versions 22 and 20.5[1]. With 
>  the 22 version if i lock the screen (run screensaver) or i try to run 
>  a wine program i experience a hard lock up no keyboard or mouse and i 
>  have to reboot the machine (i can not try to access it via ssh 
>  because i do not have a second machine). I run with the nvidia kernel 
>  module so I know my report is useless but just for the record... Here 
>  it is my config:

hm. There are no similar reports so far. Could you try to run the wine 
program from a VGA text console (first do 'xhost +' in an xterm under X 
and then 'export DISPLAY=:0' in the text console) and see whether 
anything gets output to that console? Also enable nmi_watchdog=2 - which 
could print a backtrace of the point of the hard lockup.

but in general there's nothing scheduler-specific about screensavers or 
wine - but it could be related to 3D mode of the chip (hence related to 
the nvidia module) - do you get a similar lockup if you try to run 
'glxgears'?

	Ingo
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