Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758097AbYCKPUn (ORCPT ); Tue, 11 Mar 2008 11:20:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754215AbYCKPUe (ORCPT ); Tue, 11 Mar 2008 11:20:34 -0400 Received: from gateway.drzeus.cx ([85.8.24.16]:59514 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753878AbYCKPUe (ORCPT ); Tue, 11 Mar 2008 11:20:34 -0400 Date: Tue, 11 Mar 2008 16:20:26 +0100 From: Pierre Ossman To: Andi Kleen Cc: LKML , linux-pm@lists.linux-foundation.org, "Pallipadi, Venkatesh" , Dave Jones , Andi Kleen , Alan Stern , Adam Belay , Lee Revell , Pavel Machek Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors Message-ID: <20080311162026.012744cd@mjolnir.drzeus.cx> In-Reply-To: <20080311104822.GC18917@one.firstfloor.org> References: <20080303231033.GB15255@one.firstfloor.org> <20080304040048.GA31562@codemonkey.org.uk> <20080304071423.0e6b71c1@mjolnir.drzeus.cx> <20080304181924.70aaf8c1@mjolnir.drzeus.cx> <924EFEDD5F540B4284297C4DC59F3DEEA77031@orsmsx423.amr.corp.intel.com> <20080305070201.0d16cd40@mjolnir.drzeus.cx> <20080305094023.6486ebdf@mjolnir.drzeus.cx> <20080306092730.4412d085@mjolnir.drzeus.cx> <20080309151659.63d54f38@mjolnir.drzeus.cx> <20080311085145.5fcf3186@mjolnir.drzeus.cx> <20080311104822.GC18917@one.firstfloor.org> X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.8; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1008 Lines: 26 On Tue, 11 Mar 2008 11:48:22 +0100 Andi Kleen wrote: > > I have now found a very hacky workaround that is slightly better than > > disabling C3 altogether; making C3 exclusive to one core at a time. It > > seems to kill the noise and the system now spends 50% in C3, instead of > > 0%. > > I suspect it won't do much of C3 if only one core is idle this way. > Most likely you just disabled C3 this way in a way invisible to software. > What a letdown... I'll pull out the old watt meter again and see if I can confirm that. Rgds -- -- Pierre Ossman Linux kernel, MMC maintainer http://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org -- 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/