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

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Message-ID: <8763sfpo1k.fsf@basil.nowhere.org>
Date:	Thu, 12 Jun 2008 01:08:55 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	markh@...pro.net
Cc:	Arjan van de Ven <arjan@...radead.org>,
	"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

Mark Hounschell <markh@...pro.net> writes:
>
> OK. If I am always using AMD Opteron/X64 class machines am I safe here
> when no cpu freq scaling stuff is on and I'm pinned to a particular processor?

It depends on what you want to be safe against, but if you mean
"RDTSC output has an ongoing stable frequency matching your wall clock with a constant
factor" then no, you won't be safe.

-Andi
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