linux-kernel - Re: [BISECTED] 20 ACPI interrupts per second on EEEPC 4G

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Date:	Sat, 18 Apr 2009 00:54:09 +0400
From:	Alexey Starikovskiy <aystarik@...il.com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [BISECTED] 20 ACPI interrupts per second on EEEPC 4G

Alan Jenkins wrote:
> Alan Jenkins wrote:
>   
>> Alexey Starikovskiy wrote:
>>     
>>> Alan Jenkins wrote:
>>>       
>>>> On latest git, powertop shows 20 ACPI interrupts per second. 
>>>> Previously, this was closer to 1 per second.  See attached output (a
>>>> vs b, "a" is from 2.6.29-rc8).
>>>>
>>>> This is from a pretty sparse KDE desktop.  Normally I run
>>>> gnome-power-manager, but I killed it to make sure that wasn't
>>>> causing any problems.
>>>>
>>>>         
>>>> gpe18:   60975  enabled
>>>> gpe_all:   60975
>>>> sci:   60975
>>>>
>>>> which I presume means lots of EC interrupts.
>>>>
>>>> [    0.134068] ACPI: EC: GPE = 0x18, I/O: command/status = 0x66,
>>>> data = 0x62
>>>>
>>>>         
>>> This patch looks to be a suspect:
>>> 34ff4dbccccce54c83b1234d39b7ad9e548a75dd,
>>> Please check if reversing it helps
>>>       
>> No, I still get 20 ACPI interrupts per second.
>>
>> I tried without powertop, just in case that was provoking it, but it
>> still happens:
>>
>> alan@...n-eeepc:/sys/firmware/acpi/interrupts$ cat sci; sleep 5; cat sci
>>    2583
>>    2680
>>     
>
> I did wonder whether this was due to thermal polling.  So look what I
> found with bisection :-).
>   
Great!
>
> b1569e99c795bf83b4ddf41c4f1c42761ab7f75e is first bad commit
> commit b1569e99c795bf83b4ddf41c4f1c42761ab7f75e
> Author: Matthew Garrett <mjg59@...f.ucam.org>
> Date:   Wed Dec 3 17:55:32 2008 +0000
>
>     ACPI: move thermal trip handling to generic thermal layer
>
>     The ACPI code currently carries its own thermal trip handling,
> meaning that
>     any other thermal implementation will need to reimplement it. Move
> the code
>     to the generic thermal layer.
>
>
> Regards
> Alan
>   

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