linux-kernel - Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6

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Message-ID: <20080611065816.6cff290d@infradead.org>
Date:	Wed, 11 Jun 2008 06:58:16 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	solsTiCe d'Hiver <solstice.dhiver@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6

On Wed, 11 Jun 2008 15:52:57 +0200 (CEST)
Jan Engelhardt <jengelh@...ozas.de> wrote:

> 
> On Wednesday 2008-06-11 15:36, Arjan van de Ven wrote:
> >> >> btw this is scary; the Mhz line in /proc/cpuinfo doesn't have
> >> >> much meaning really, so applications using it and depending on
> >> >> it is a rather big disaster ;-(
> >> >> 
> >> >> Does anyone know why jackd wants to use this?
> >> 
> >> It would be nice to have a /sys file where the CPU frequency is in,
> >
> >may I ask why? What would you do with it?
> 
> Off the top off the head, just for reporting to the user. Desklets
> and stuff.

even then it doesn't mean much ;-(

> >CPU frequency is...
> >1) not something that is fixed; it changes all the time
> >2) not a good indication for performance; remember the 3.4Ghz
> >pentium4, a 2Ghz Core2Duo outperforms it
> >3) something which the cpu itself barely honors (the clock stops
> >during idle etc etc)


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