linux-kernel - Re: 20000+ wake-ups/second in 2.6.24. Bug?

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Message-Id: <200712020120.36439.rjw@sisk.pl>
Date:	Sun, 2 Dec 2007 01:20:35 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mark Lord <lkml@....ca>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, abelay@...ell.com,
	lenb@...nel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: 20000+ wake-ups/second in 2.6.24.   Bug?

On Sunday, 2 of December 2007, Mark Lord wrote:
> Arjan van de Ven wrote:
> > On Sat, 01 Dec 2007 18:43:39 -0500
> > Mark Lord <lkml@....ca> wrote:
> > 
> >> Dagnabbit.. it's done it again.. went from 100-200 wakeups/sec
> >> back up to 20000+ wakeups/sec.  This time *with* the powertop patches
> >> in place.
> >>
> >> Somethings broken in there, but I don't know what.
> >> Or how to make it happen on demand.. it's fine after rebooting again.
> >>
> >> ???
> >>
> >> At least now I know to look when I hear the fan turning on
> >> when the system is otherwise supposed to be idle..
> >>
> >> 2.6.23 did not have this problem.
> > 
> > actually we have reports of 2.6.23 having the exact same problem.
> > The thing is, "something" is causing the system to go into a state
> > where the cpu throws us right out of the C-state the kernel asks for.
> ...
> 
> Ahh.  Okay, this machine here did not have the problem on 2.6.23.

So on this particular machine it is a regression.

I'm tempted to add it to the list of recent regressions in case it appears on
someone else's system on which 2.6.23 works correctly.  Objections?

Rafael
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