linux-kernel - Re: regression: 2.6.32-rc8 shuts down after reaching critical temperature

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Message-ID: <20091202153536.GA20324@lst.de>
Date:	Wed, 2 Dec 2009 16:35:36 +0100
From:	Christoph Hellwig <hch@....de>
To:	Thomas Renninger <trenn@...e.de>
Cc:	Christoph Hellwig <hch@....de>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Zhang Rui <rui.zhang@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: regression: 2.6.32-rc8 shuts down after reaching critical temperature

On Wed, Dec 02, 2009 at 04:07:52PM +0100, Thomas Renninger wrote:
> Some more hints you may want to try:
> 
>   - Does cpufreq work at all?
>     Does this dir exist: /sys/devices/system/cpu/cpu*/cpufreq

Yes.

>     If temp of:
>     watch -n1 cat /proc/acpi/thermal_zone/THM1/temperature
>     goes beyond 96 C
>     an ACPI processor event must get thrown and this:
>     /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
>     will get limited (lower than ../cpufreq/cpuinfo_max_freq).

The speeds change quite constantly under a kernel compile workload, but
most of the time it's at 2240800 vs cpuinfo_max_freq which is 2801000

>     echo xy >/sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
>     may be bad workaround.

echo 2240800 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo 2240800 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq

made it survive a kernel compile for me, with an observed maximum
temperature of 87 C.

More later..
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