linux-kernel - RE: Slower CPU frequency reported by the kernel

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Message-ID: <1449F58C868D8D4E9C72945771150BDFD965A1@SAUSEXMB1.amd.com>
Date:	Tue, 6 Feb 2007 12:38:11 -0600
From:	"Langsdorf, Mark" <mark.langsdorf@....com>
To:	lnx.tmp@...il.com, linux-kernel@...r.kernel.org
Subject: RE: Slower CPU frequency reported by the kernel

> > I'm using a PC with AMD 64 3000+ cpu which is theoricaly running at
> > 2Ghz. But when looking at /proc/cpuinfo, the kernel reports that it
> > runs only at 1Ghz:
> > ...
> > What's going wrong ?
> 
> Do you have feature called "Cool N' Quiet" enabled in BIOS?
> I had the same problem and disabling the feature the problem resolved.

Linux reports the frequency the processor is currently running at.
Cool N' Quiet is a feature that allows the processor to run at a
lower frequency and voltage when it is idle, thereby saving you
power and letting your fans run slower and quieter.  Don't turn it
off.

-Mark Langsdorf
AMD, Inc.


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