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

Rafael J. Wysocki
2007-12-02T00:02:12Z

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@rtr.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