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

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Date:	Mon, 13 Apr 2009 10:04:08 +0800
From:	yakui_zhao <yakui.zhao@...el.com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Alexey Starikovskiy <aystarik@...il.com>,
	"linux-acpi@...r.kernel.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

On Sun, 2009-04-12 at 23:54 +0800, 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 :-).
Does the issue still exist if the following commit is reverted?
Thanks.
> 
> 
> 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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