linux-kernel - Re: 3.2GHz cpus with cpufreq become 2.8GHz

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Message-ID: <20061020073752.GC1898@ff.dom.local>
Date:	Fri, 20 Oct 2006 09:37:52 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Krzysztof Oledzki <olel@....pl>
Cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk
Subject: Re: 3.2GHz cpus with cpufreq become 2.8GHz

On 20-10-2006 00:25, Krzysztof Oledzki wrote:
...
> I will check this, thank you. BTW: what wrong is with p4-clockmod? I was 
> not able to find any information that it is broken and should not be used?

At least it is very suspected:

"Subject: Hardware bug or kernel bug?
On Mon, Oct 16, 2006 at 03:32:38PM +0100, David Johnson wrote:
..
> I've found the culprit - CPU Frequency Scaling.
> With it enabled I get the reboots, with it disabled I don't. That's the same
> with every kernel version I've tried (2.6.19-rc1+rc2, 2.6.17.13 & Centos'
> 2.6.9) The system was using the p4-clockmod driver and the ondemand governor.

> I'm still not sure exactly what the problem is - the reboots only happen in
> the circumstances I've mentioned and are not triggered by changes in clock
> speed alone - but disabling cpufreq seems to make it go away... "

Cheers,

Jarek P.
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