From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932236AbVHHWRV (ORCPT ); Mon, 8 Aug 2005 18:17:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932284AbVHHWRV (ORCPT ); Mon, 8 Aug 2005 18:17:21 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:4744 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S932236AbVHHWRU (ORCPT ); Mon, 8 Aug 2005 18:17:20 -0400 Date: Mon, 8 Aug 2005 23:54:44 +0200 From: Pavel Machek To: Con Kolivas Cc: "Theodore Ts'o" , linux-kernel@vger.kernel.org, tony@atomide.com, tuukka.tikkanen@elektrobit.com, ck@vds.kolivas.org Subject: Re: [patch] i386 dynamic ticks 2.6.13-rc4 (code reordered) Message-ID: <20050808215444.GA2589@elf.ucw.cz> References: <200508021443.55429.kernel@kolivas.org> <20050806145418.GA16523@thunk.org> <200508070100.55319.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200508070100.55319.kernel@kolivas.org> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > I monitored > > power utilization using pmstats-0.2, and used > > /proc/acpi/processor/CPU/power to monitor bus mastering activity and the > > CPU C-states. > > > > As soon as I disabled dynamic tick using: > > > > echo 0 > /sys/devices/system/timer/timer0/dyn_tick_state > > > > The number of ticks went up to 1024, bus mastering activity dropped to > > zero, and the processor entered C4 state, and power utilization > > dropped by 20%. > > > > When I enabled dynamic tick using: > > > > echo 1 > /sys/devices/system/timer/timer0/dyn_tick_state > > > > The number of ticks dropped down to 60-70 HZ, bus mastering activity > > jumpped up to being almost always active, > > Anyone know why this would happen? Bus mastering monitor was broken last time I checked... it depended on HZ in ugly way or something like that. It was on ACPI mailing lists. Pavel -- if you have sharp zaurus hardware you don't need... you know my address