Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2

[Ingo Molnar <mingo@elte.hu>]

* Adam Heath <doogie@debian.org> wrote:

> > > I'm seeing something very odd.  It's against 29-0.  I also seem to
> > > recall seeing something similiar reported earlier.
> > >
> > > I'm seeing pauses on my system.  Not certain what is causing it.
> > > Hitting a key on the keyboard unsticks it.
> >
> > at first sight this looks like a scheduling/wakeup anomaly. Please
> > re-report this if it happens with the current (30-4) kernel too. Also,
> > could you test the vanilla -mm tree, it has a few scheduler updates too.
> 
> 2.6.10-rc1-mm3 doesn't have the same problem.  Didn't have a more
> recent mm kernel available last night.  Will compile one, and always
> keep it available.

-rc2-mm2 would be nice to test - there are a number of new interactivity
fixes from Con being test-driven in -mm right now. In particular, these
patches were added in -rc1-mm4. These are the patches in question:

 sched-adjust_timeslice_granularity.patch
 requeue_granularity.patch
 sched-remove_interactive_credit.patch

you can download them individually from:

 http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc2/2.6.10-rc2-mm2/broken-out/

so if these symptoms still occur with vanilla -rc2-mm2, could you try to
unapply them, in reverse order? (there might be rejects when you try
that, due to patch dependencies - let me know if it doesnt work out and
i'll do an undo patch.)

	Ingo