Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758298AbYFKXJK (ORCPT ); Wed, 11 Jun 2008 19:09:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753330AbYFKXI6 (ORCPT ); Wed, 11 Jun 2008 19:08:58 -0400 Received: from smtp-out03.alice-dsl.net ([88.44.63.5]:13961 "EHLO smtp-out03.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753325AbYFKXI5 (ORCPT ); Wed, 11 Jun 2008 19:08:57 -0400 To: markh@compro.net Cc: Arjan van de Ven , "linux-os (Dick Johnson)" , Jan Engelhardt , "Kok, Auke" , "solsTiCe d'Hiver" , linux-kernel@vger.kernel.org Subject: Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6 From: Andi Kleen References: <200806102152.23286.solstice.dhiver@gmail.com> <20080610131314.5f7069e6@infradead.org> <484EE71A.40002@intel.com> <20080611063639.5e1eea5b@infradead.org> <20080611065816.6cff290d@infradead.org> <20080611083644.32afc823@infradead.org> <4850046C.4070602@compro.net> <20080611104446.3b0ce2d9@infradead.org> <48501159.4050908@compro.net> Date: Thu, 12 Jun 2008 01:08:55 +0200 In-Reply-To: <48501159.4050908@compro.net> (Mark Hounschell's message of "Wed, 11 Jun 2008 13:54:33 -0400") Message-ID: <8763sfpo1k.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 11 Jun 2008 23:01:43.0647 (UTC) FILETIME=[1DCEDEF0:01C8CC17] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 639 Lines: 15 Mark Hounschell 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/