linux-kernel - Re: 2.6.21-rc2-mm1

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Message-Id: <20070305151120.e5eab328.akpm@linux-foundation.org>
Date:	Mon, 5 Mar 2007 15:11:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"J.A. =?ISO-8859-1?Q?Magall=F3n" ?= <jamagallon@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-rc2-mm1

On Mon, 5 Mar 2007 23:20:58 +0100
"J.A. Magall__n" <jamagallon@....com> wrote:

> On Fri, 2 Mar 2007 03:00:26 -0800, Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > 
> > Temporarily at
> > 
> >   http://userweb.kernel.org/~akpm/2.6.21-rc2-mm1/
> > 
> > Will appear later at
> > 
> >   ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc2/2.6.21-rc2-mm1/
> > 
> > 
> 
> I'm also noticing very bad behaviour wrt scheduling, I think. When I launch my
> parallel cpu burning code, the system _really_ stalls, the mouse in X11 is not
> jerky, it is _stuck_ for a couple or three seconds...
> 
> The only diffrecence is that, trying to solve nVidia driver problems, I disabled
> BKL preemption:
> 
> werewolf:/usr/src/linux# grep PREEMPT .config
> # CONFIG_PREEMPT_RCU is not set
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> CONFIG_PREEMPT=y
> # CONFIG_PREEMPT_BKL is not set

Do you think that is a problem which is introduced by -rc1-mm1?

It'd be good if you can capture the `top' output while this is happening -
it could be the longstanding problem where an app's sleep/run pattern
permits it to get a lot of dynamic priority boosting, even though it is
CPU-intensive.

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