Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 13 Jul 2002 20:38:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 13 Jul 2002 20:38:42 -0400 Received: from pc2-cwma1-5-cust12.swa.cable.ntl.com ([80.5.121.12]:32241 "EHLO irongate.swansea.linux.org.uk") by vger.kernel.org with ESMTP id ; Sat, 13 Jul 2002 20:38:41 -0400 Subject: Re: Linux 2.4.19-rc1-ac3 From: Alan Cox To: Peter Osterlund Cc: Zwane Mwaikambo , Linux Kernel In-Reply-To: References: <1026584861.13886.27.camel@irongate.swansea.linux.org.uk> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6) Date: 14 Jul 2002 02:50:37 +0100 Message-Id: <1026611437.13885.37.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 931 Lines: 25 On Sat, 2002-07-13 at 20:43, Peter Osterlund wrote: > 1. apm idle mode consumes less power at lower frequencies CPU halting makes a difference on older cpus but not really on modern ones . > 2. The lower clock frequency means less work gets done, for example > because window updates become less frequent when moving windows. Your CPU has a clock range, zero is not in that range. If you can complete all your work within an acceptable time slice (based on previous task histories) there is no need to run full on. > 3. The cpu voltage is automatically reduced when the frequency is > reduced. True for some x86 processors, either automatically, or on some controlled by us. - 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/