Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758835Ab2HVJKX (ORCPT ); Wed, 22 Aug 2012 05:10:23 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:53578 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753391Ab2HVJKU (ORCPT ); Wed, 22 Aug 2012 05:10:20 -0400 Date: Wed, 22 Aug 2012 11:10:13 +0200 From: Ingo Molnar To: Matthew Garrett Cc: Arjan van de Ven , Peter Zijlstra , Alex Shi , Suresh Siddha , vincent.guittot@linaro.org, svaidy@linux.vnet.ibm.com, Andrew Morton , Linus Torvalds , "linux-kernel@vger.kernel.org" , Thomas Gleixner , Paul Turner Subject: Re: [discussion]sched: a rough proposal to enable power saving in scheduler Message-ID: <20120822091013.GB23336@gmail.com> References: <20120820080606.GA6931@gmail.com> <20120820181651.GA737@srcf.ucam.org> <20120821094203.GB12385@gmail.com> <20120821113951.GA22436@srcf.ucam.org> <20120821151910.GA5359@gmail.com> <20120821152828.GB28241@srcf.ucam.org> <20120821155908.GA5499@gmail.com> <20120821161324.GA29665@srcf.ucam.org> <20120821182346.GA7325@gmail.com> <20120821183414.GA436@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120821183414.GA436@srcf.ucam.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 883 Lines: 27 * Matthew Garrett wrote: > [...] > > Our power consumption is worse than under other operating > systems is almost entirely because only one of our three GPU > drivers implements any kind of useful power management. [...] ... and because our CPU frequency and C state selection logic is doing pretty much the worst possible decisions (on x86 at least). Regardless, you cannot possibly seriously suggest that because there's even greater suckage elsewhere for some workloads we should not even bother with improving the situation here. Anyway, I agree with Alan that actual numbers matter. Thanks, Ingo -- 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/