Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932321AbWJBNk7 (ORCPT ); Mon, 2 Oct 2006 09:40:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932322AbWJBNk7 (ORCPT ); Mon, 2 Oct 2006 09:40:59 -0400 Received: from www.osadl.org ([213.239.205.134]:11709 "EHLO mail.tglx.de") by vger.kernel.org with ESMTP id S932321AbWJBNk6 (ORCPT ); Mon, 2 Oct 2006 09:40:58 -0400 Subject: Re: [patch 00/21] high resolution timers / dynamic ticks - V2 From: Thomas Gleixner Reply-To: tglx@linutronix.de To: Valdis.Kletnieks@vt.edu Cc: Andrew Morton , LKML , Ingo Molnar , Jim Gettys , John Stultz , David Woodhouse , Arjan van de Ven , Dave Jones In-Reply-To: <200610021302.k92D23W1003320@turing-police.cc.vt.edu> References: <20061001225720.115967000@cruncher.tec.linutronix.de> <200610021302.k92D23W1003320@turing-police.cc.vt.edu> Content-Type: text/plain Date: Mon, 02 Oct 2006 15:43:02 +0200 Message-Id: <1159796582.1386.9.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1524 Lines: 38 On Mon, 2006-10-02 at 09:02 -0400, Valdis.Kletnieks@vt.edu wrote: > On Sun, 01 Oct 2006 22:59:01 -0000, Thomas Gleixner said: > > the following patch series is an update in response to your review. > > First runtime results - no lockups or other severe badness in a half-hour or so > of running. > > -mm2-hrt-dynticks5 shows severe clock drift issues if you run 'cpuspeed'. > > Using speedstep-ich as a kernel built-in, and cpuspeed is invoked as: > > cpuspeed -d -n -i 10 -p 10 50 -a /proc/acpi/ac_adapter/*/state > > If cpuspeed drops the CPU speed from the default 1.6Ghz down to 1.2Ghz (the > only 2 speeds available on this core), the system clock proceeds to lose > about 15 seconds a minute. I haven't dug further into why yet. (If the system > is busy so cpuspeed keeps the processor at 1.6Ghz, the clock doesn't drift > as much - so it looks like a "when speed is 1.2Ghz" issue...) Can you please send me the bootlog and further dmesg output (especially when related to timers / cpufreq). > I'm also seeing gkrellm reporting about 25% CPU use when "near-idle" (X is up > but not much is going on) when that's usually down around 5-6%. I need to > collect some oprofile numbers and investigate that as well. I look into the accounting fixups again. tglx - 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/