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

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Date:	Mon, 28 Apr 2008 20:01:00 +0200
From:	Daniel Klaffenbach <danielklaffenbach@...il.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"Len Brown" <lenb@...nel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.25-stable PATCH] regression: powertop says 120K wakeups/sec

Pallipadi, Venkatesh wrote:
> 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)
No, C1/C2 did not seem to work with 2.6.24 - at least powertop reported 99,9% 
C0 usage. It was the same behavior as after applying the wakeup patch. 
However in 2.6.25 and 2.6.25-git11 C1/C2 worked correctly and C2 showed up in 
pt. But after applying your patch to 2.6.25-git11 they did not:

git11:
PowerTOP version 1.9       (C) 2007 Intel Corporation
Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 9,4%)         1,80 Ghz   100,0%
C1                0,0ms ( 0,0%)         1,60 Ghz     0,0%
C2                0,4ms (90,6%)          800 Mhz     0,0%
Wakeups-from-idle per second : 9051,0   interval: 5,0s

git11 with wakeup-patch:
PowerTOP version 1.9       (C) 2007 Intel Corporation
Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (99,9%)         1,80 Ghz   100,0%
C1                0,0ms ( 0,0%)         1,60 Ghz     0,0%
C2                0,2ms ( 0,1%)          800 Mhz     0,0%
Wakeups-from-idle per second : 59,8     interval: 10,0s

In both cases the system was idle. I've uploaded the files you wanted:
http://www-user.tu-chemnitz.de/~klada/misc/kernel/cpuidle_git11.txt
http://www-user.tu-chemnitz.de/~klada/misc/kernel/cpuidle_git11_wakeuppatch.txt
http://www-user.tu-chemnitz.de/~klada/misc/kernel/dmesg_git11.txt
http://www-user.tu-chemnitz.de/~klada/misc/kernel/dmesg_git11_wakeuppatch.txt
http://www-user.tu-chemnitz.de/~klada/misc/kernel/nx6125_acpidump.out

If there is anything else I can do for debugging this issue please let me 
know.

- Daniel

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