linux-kernel - Re: PROBLEM: /proc/cpuinfo reports erroneous CPU frequency. (2.6.23 & 2.6.22)

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Message-ID: <20071210180438.GA22488@redhat.com>
Date:	Mon, 10 Dec 2007 13:04:38 -0500
From:	Dave Jones <davej@...hat.com>
To:	Alexander Rajula <chris@...dmail.nu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: /proc/cpuinfo reports erroneous CPU frequency.
	(2.6.23 & 2.6.22)

On Mon, Dec 10, 2007 at 02:48:54AM +0100, Alexander Rajula wrote:
 > While using 2.6.23 and 2.6.22 (earlier kernels have not been tested) /proc/cpuinfo reports the wrong CPU frequency:
 > 
 > 
 > While overclocking an AMD Athlon X2 (2GHz) CPU /proc/cpuinfo reports the wrong CPU frequency.
 > I am quite puzzled by this.
 > Is this an error in the kernel, or is there something strange going on?

cpu frequency scaling relies on static tables in the BIOS that contain
a bunch of predefined frequencies. When you overclock, you're running
at frequencies that aren't in these tables.  Everything falls apart as a result.

There's nothing here to fix, don't overclock.

	Dave

-- 
http://www.codemonkey.org.uk
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