linux-kernel - RE: 2.6.25 regression: powertop says 120K wakeups/sec

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Date:	Mon, 31 Mar 2008 11:34:01 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Mark Lord" <lkml@....ca>, "Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"David Brownell" <david-b@...bell.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	"Len Brown" <lenb@...nel.org>
Subject: RE: 2.6.25 regression: powertop says 120K wakeups/sec

 

>-----Original Message-----
>From: Mark Lord [mailto:lkml@....ca] 
>Sent: Monday, March 31, 2008 10:43 AM
>To: Rafael J. Wysocki
>Cc: Pallipadi, Venkatesh; David Brownell; Andrew Morton; 
>linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org; Len Brown
>Subject: Re: 2.6.25 regression: powertop says 120K wakeups/sec
>
>Rafael J. Wysocki wrote:
>> On Friday, 28 of March 2008, Venki Pallipadi wrote:
>>> On Fri, Mar 28, 2008 at 03:09:22PM -0700, David Brownell wrote:
>>>> On Friday 28 March 2008, Pallipadi, Venkatesh wrote:
>>>>> You should have a dmesg line which looks like
>>>>> ACPI: CPU0 (power states: C1[C1] C2[C2]
>>>>> Do you see C2 in such line?
>>>> Yes:
>>>>
>>>> ACPI: CPU0 (power states: C1[C1] C2[C2])
>>>
>>> David,
>>>
>>> I think I figured out the bug...
>>>
>>> Can you try the below patch and confirm that it works (over 
>upstream - ignore
>>> the earlier revert patch I sent to you).
>>>
>>> Thanks,
>>> Venki
>>>
>>> ----
>>>
>>>
>>> Patch to fix huge number of wakeups reported due to recent 
>changes in
>>> processor_idle.c. The problem was that the entry_method 
>determination was
>>> broken due to one of the recent commits (bc71bec91f987) causing
>>> C1 entry to not to go to halt. This should also fix the 
>hang reported here.
>>> http://bugzilla.kernel.org/show_bug.cgi?id=10093
>> 
>> Ah, thanks for figuring that out.  As a regression fix, it 
>should go upstream
>> ASAP, I think.
>..
>
>Would this have any applicability to 2.6.24 as well?
>

No. This patch is for a regression that happened post .24.
pre .24 will be a different problem.

Thanks,
Venki
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