linux-kernel - Re: cpufreq longhaul locks up

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Message-ID: <Pine.LNX.4.61.0705050132410.18504@yvahk01.tjqt.qr>
Date:	Sat, 5 May 2007 01:37:29 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	David Johnson <dj@...id-web.co.uk>
cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk
Subject: Re: cpufreq longhaul locks up

On May 4 2007 23:20, David Johnson wrote:
>
>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 had tried this:

-  if (enable_arbiter_disable()) {
+  if (0 && enable_arbiter_disable()) {

to skip enabling the northbridge. Unfortunately, I do not seem to have
southbridge or ACPI support.

>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.

I think I did not see any oops, though I (1) did not redirect the
kernel output back to tty0 [the distro moves it away to tty11]
so I might have missed something, but (2) netconsole did not send
anything. IIRC, the kernel still catches sysrq if it paniced, i.e.
as a result of not finding a proper root device during startup;
but no sysrq, so it seems a harder lockup. Maybe I should try
without all the modules loaded and/or disable some hw in the bios.

Jan
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