From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755817Ab0CEWt2 (ORCPT ); Fri, 5 Mar 2010 17:49:28 -0500 Received: from cavan.codon.org.uk ([93.93.128.6]:49046 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755319Ab0CEWt0 (ORCPT ); Fri, 5 Mar 2010 17:49:26 -0500 Date: Fri, 5 Mar 2010 22:49:09 +0000 From: Matthew Garrett To: Pavel Machek Cc: "Pallipadi, Venkatesh" , Randy Dunlap , Ingo Molnar , H Peter Anvin , Thomas Gleixner , Len Brown , Dave Jones , "linux-kernel@vger.kernel.org" , "linux-acpi@vger.kernel.org" Subject: Re: [patch 2/2] x86: Manage ENERGY_PERF_BIAS based on cpufreq governor Message-ID: <20100305224909.GA21853@srcf.ucam.org> References: <20100303000649.757684000@intel.com> <20100303000849.278509000@intel.com> <4B8DADB9.1040302@xenotime.net> <20100303215453.GG2579@ucw.cz> <1267662469.16916.1020.camel@localhost.localdomain> <20100305091949.GA31554@atrey.karlin.mff.cuni.cz> <7C53B33EE871F14797C999838AA8B5A914ACD58C@orsmsx505.amr.corp.intel.com> <20100305204029.GB20554@elf.ucw.cz> <20100305205522.GA15489@srcf.ucam.org> <20100305211329.GC20554@elf.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100305211329.GC20554@elf.ucw.cz> User-Agent: Mutt/1.5.18 (2008-05-17) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: mjg59@cavan.codon.org.uk X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 05, 2010 at 10:13:30PM +0100, Pavel Machek wrote: > On Fri 2010-03-05 20:55:22, Matthew Garrett wrote: > > On Fri, Mar 05, 2010 at 09:40:29PM +0100, Pavel Machek wrote: > > > > > That can be only true if it does not give benefits period... AC and > > > battery power are quite different scenarios. > > > > No, they're not. > > Yes, they are. > > Would you care to elaborate? I may very well want top power on AC > power, and max powersavings on battery; most people do. You may want that. But power constraints aren't limited to battery, and being on battery doesn't inherently mean that you're power constrained. Mixing these concepts results in all kinds of issues. -- Matthew Garrett | mjg59@srcf.ucam.org