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

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Message-ID: <4751F484.6040204@rtr.ca>
Date:	Sat, 01 Dec 2007 18:55:48 -0500
From:	Mark Lord <lkml@....ca>
To:	Arjan van de Ven <arjan@...radead.org>
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?

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

Cheers!
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