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

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Message-ID: <20071201161302.731b80d3@laptopd505.fenrus.org>
Date:	Sat, 1 Dec 2007 16:13:02 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mark Lord <lkml@....ca>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, abelay@...ell.com,
	lenb@...nel.org, rjw@...k.pl, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: 20000+ wake-ups/second in 2.6.24.   Bug?

On Sat, 01 Dec 2007 18:55:48 -0500
Mark Lord <lkml@....ca> 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.
> 
> > Some people have seen that not loading yenta at all will just make
> > this not happen at all...
> ...
> 
> No yenta/cardbus here -- it's all PCIe.

but.. is yenta loaded or built into the kernel?
or is the config option off?
Also, do you have a TI firewire bridge?
(just asking the common patterns we've sort of kinda seen so far)

> If you have any debug patches that could detect or help next time I
> see it, then feel free to toss them this way.

one thing to try (just as data collection) is to do 
lspci -vvxxx 
before it happens, and then again after it happens
and then diff to see if something changed ;(

(yes this is very crude; we've not been able to chase this one down at
all so far).
-- 
If you want to reach me at my work email, use arjan@...ux.intel.com
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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