linux-kernel - RE: [2.6.25-stable PATCH] regression: powertop says 120K wakeups/sec

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Message-ID: <924EFEDD5F540B4284297C4DC59F3DEEF31621@orsmsx423.amr.corp.intel.com>
Date:	Mon, 28 Apr 2008 09:36:01 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Daniel Klaffenbach" <danielklaffenbach@...il.com>,
	"Len Brown" <lenb@...nel.org>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: RE: [2.6.25-stable PATCH] regression: powertop says 120K wakeups/sec

 

>-----Original Message-----
>From: Daniel Klaffenbach [mailto:danielklaffenbach@...il.com] 
>Sent: Monday, April 28, 2008 3:10 AM
>To: Len Brown
>Cc: Linux Kernel Mailing List; Pallipadi, Venkatesh
>Subject: Re: [2.6.25-stable PATCH] regression: powertop says 
>120K wakeups/sec
>
>> commit 0fda6b403f0eca66ad8a7c946b3996e359100443
>>
>> 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.
>>
>> http://lkml.org/lkml/2008/3/22/124
>>
>> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
>> Signed-off-by: Len Brown <len.brown@...el.com>
>OK, this fixes my issue with the massive amount of wakeups:
>http://lkml.org/lkml/2008/4/24/70
>
>However the CPU does not really go to C1 or C2 after applying 
>this patch to 
>the latest git kernel:
>
>Cn                Avg residency       P-states (frequencies)
>C0 (cpu running)        (99,4%)         1,80 Ghz     0,0%
>C1                0,0ms ( 0,0%)         1,60 Ghz     0,0%
>C2                0,0ms ( 0,6%)          800 Mhz   100,0%
>


Did C1, C2 work fine with 2.6.24?
Can you send me the full dmesg when it is failing to enter C1, C2 with
latest git + patch.
Output of
#grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*
And also attach the acpidump output (pmtools package here
http://www.lesswatts.org/projects/acpi/utilities.php)

Thanks,
Venki
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