Re: 2.6.21-rc2-mm1

Andrew Morton
2007-03-05T23:11:26Z

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

> On Fri, 2 Mar 2007 03:00:26 -0800, Andrew Morton <akpm@linux-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.