Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161212AbWAMAqL (ORCPT ); Thu, 12 Jan 2006 19:46:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932523AbWAMAqK (ORCPT ); Thu, 12 Jan 2006 19:46:10 -0500 Received: from mx1.redhat.com ([66.187.233.31]:43966 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S932678AbWAMAqJ (ORCPT ); Thu, 12 Jan 2006 19:46:09 -0500 Date: Thu, 12 Jan 2006 19:46:00 -0500 From: Dave Jones To: Adam Belay , Con Kolivas , ck list , linux kernel mailing list Subject: Re: 2.6.15-ck1 Message-ID: <20060113004600.GB6883@redhat.com> Mail-Followup-To: Dave Jones , Adam Belay , Con Kolivas , ck list , linux kernel mailing list References: <200601041200.03593.kernel@kolivas.org> <20060104190554.GG10592@redhat.com> <20060112221133.GA11601@neo.rr.com> <20060112230315.GO19827@redhat.com> <20060113004236.GB11601@neo.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060113004236.GB11601@neo.rr.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1193 Lines: 26 On Thu, Jan 12, 2006 at 07:42:36PM -0500, Adam Belay wrote: > > > It might be possible to do even a little better. Currently, I'm developing a > > > new ACPI idle policy that tries to take advantage of the long time we may > > > be able to spend in a C3 state. > > > > As soon as that usb timer hits (every 250ms iirc) you'll bounce back out > > of any low-power state you may be in. It's a bit craptastic that we do > > this, even if we don't have any USB devices plugged in. > > I agree that's annoying, but isn't 250ms not often enough to make any > significant difference as far as power management is concerned? > Generally some bus master activity will come along in a shorter time frame, > causing a jump out of C3. All I know is that when I removed the usb modules, the power usage stopped fluctuating as often, and it spent longer times hovering around the 18-19W mark instead of bouncing anywhere between 18-22W. Dave - 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/