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

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Message-ID: <20080611135828.29f6a7d7@infradead.org>
Date:	Wed, 11 Jun 2008 13:58:28 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	markh@...pro.net
Cc:	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	"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 16:37:38 -0400
Mark Hounschell <markh@...pro.net> wrote:

> > Mark 
> > 
> 
> Ok, what would one use besides the tsc to take a fast high-res time
> stamp in a kernel module that could also be used in user land (same
> time source) to for instance calculate  the the time between an event
> in the kernel to an event in user land?
> 
> do_gettimeofday / gettimeofday are not really acceptable.


btw you also changed the problem from "what is the cpu frequency" to
"how usable is rdtsc for time". My entire point was that these weren't
related...


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