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

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Message-ID: <924EFEDD5F540B4284297C4DC59F3DEEC83E9A@orsmsx423.amr.corp.intel.com>
Date:	Fri, 28 Mar 2008 16:07:07 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"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: linux-acpi-owner@...r.kernel.org 
>[mailto:linux-acpi-owner@...r.kernel.org] On Behalf Of Rafael 
>J. Wysocki
>Sent: Friday, March 28, 2008 4:01 PM
>To: Pallipadi, Venkatesh
>Cc: 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
>
>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.
>

Lets just wait for confirmation from either David or in bug #10093. Yes.
Once we get that confirmation this should go upstream.

Thanks,
Venki
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