From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262536AbVHDQ0R (ORCPT ); Thu, 4 Aug 2005 12:26:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262537AbVHDQ0R (ORCPT ); Thu, 4 Aug 2005 12:26:17 -0400 Received: from pop.gmx.de ([213.165.64.20]:13490 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S262536AbVHDQ0O (ORCPT ); Thu, 4 Aug 2005 12:26:14 -0400 X-Authenticated: #1725425 Date: Thu, 4 Aug 2005 18:25:13 +0200 From: Marc Ballarin To: Christian Leber Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 Message-Id: <20050804182513.769e1887.Ballarin.Marc@gmx.de> In-Reply-To: <20050803232236.GA13520@core.home> References: <200508031559.24704.kernel@kolivas.org> <20050803232236.GA13520@core.home> X-Mailer: Sylpheed version 2.0.0rc (GTK+ 2.6.7; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 4 Aug 2005 01:22:36 +0200 Christian Leber wrote: > Just a few numbers: > > I tried it on a Laptop (Dell C810, P3m 1133 mhz) and measured the power > usage with an external device and it stayed with or without patch at > 27W. (HZ was at about 28) Does your machine enter C3 state? Check the usage in /proc/acpi/processor/CPU0/power If usage is 0, unplug all USB peripherals (at least those connected to uhci controllers). Also shut down sound servers. Without C3, there won't be any power savings from lower HZ. Desktop CPUs often don't support C3 at all. Marc