linux-kernel - Re: [rc8] Regression: key repeats and skips in music during compilation

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Date:	Mon, 7 Apr 2008 14:03:58 +0200
From:	Frans Pop <elendil@...net.nl>
To:	linux-kernel@...r.kernel.org
Cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [rc8] Regression: key repeats and skips in music during compilation

On Monday 07 April 2008, Dhaval Giani wrote:
> On Mon, Apr 07, 2008 at 12:29:26PM +0200, Rafael J. Wysocki wrote:
> > On Monday, 7 of April 2008, Frans Pop wrote:
> > > On Monday 07 April 2008, Rafael J. Wysocki wrote:
> > > > On Sunday, 6 of April 2008, Rafael J. Wysocki wrote:
> > > > > On Friday, 4 of April 2008, Frans Pop wrote:
> > > > > > While compiling glibc I am getting frequent short skips in
> > > > > > music play anddddddddddddddddd I have now three times seen key
> > > > > > repeats (as in this sentence). When there is a skip in the
> > > > > > music, there is also a delay in characters being typed
> > > > > > appearing on the screen.
> > > > >
> > > > > Can you test with CONFIG_GROUP_SCHED unset, please?
> > > >
> > > > I was able to reproduce this issue with -rc8 on one of my test
> > > > systems,
> > >
> > > In the mean time I have verified that the issue also existed in rc6,
> > > so it's not a recent regression.
> > >
> > > > but I'm not any more with the current Linus' tree and
> > > > CONFIG_GROUP_SCHED unset, FWIW.
> > >
> > > Hmm. Does that mean that you _can_ reproduce it with git HEAD and
> > > CONFIG_GROUP_SCHED set? That would mean it is still an issue in HEAD
> > > and group scheduling is the culprit.
> >
> > Well, CONFIG_GROUP_SCHED is known to cause problems, AFAICS, and some
> > fixes are scheduled for the 2.6.26 time frame.
>
> I thought we had most of the issues ironed out.

Note that I can also reproduce the issue with a kernel that does *not* have 
CONFIG_GROUP_SCHED set. I still get the music skips (maybe less frequently, 
but that's hard to measure), and I've have also seen key repeats once.

Anything I can do to provide additional info on this?

Cheers,
FJP

# CONFIG_CGROUPS is not set
# CONFIG_GROUP_SCHED is not set
(config otherwise identical to my initial mail)
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