linux-kernel - Re: cpufreq longhaul locks up

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Date:	Fri, 4 May 2007 23:20:40 +0100
From:	David Johnson <dj@...id-web.co.uk>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk
Subject: Re: cpufreq longhaul locks up

On Friday 04 May 2007 11:16, you wrote:
>
> I found that setting the cpufreq governor to ondemand making the box
> lock up solid in 2.6.20.2 and 2.6.21 after a few seconds. Sysrq
> does not work anymore, and the last messages are:
>

I've been seeing a similar issue, but with a few differences.
I'm running 2.6.21.1 on the same CPU as yourself:

longhaul: VIA C3 'Nehemiah C' [C5P] CPU detected.  Powersaver supported.
longhaul: Using ACPI support.

It seems that longhaul on my system is 'using ACPI support' whereas on yours 
it is 'using northbridge support'. I'm getting lockups after approx. 2-3 
hours using the ondemand governor. It has no problem changing the clock 
speed, and runs at the minimum speed most of the time.

I seem to recall that I get an oops when my system locks-up (the system runs 
headless normally, so it isn't easy to check). I'll investigate.

Regards,
David.

-- 
David Johnson
www.david-web.co.uk
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