Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933754Ab2HWIUV (ORCPT ); Thu, 23 Aug 2012 04:20:21 -0400 Received: from mga09.intel.com ([134.134.136.24]:6264 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030253Ab2HWIT1 (ORCPT ); Thu, 23 Aug 2012 04:19:27 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,299,1344236400"; d="scan'208";a="190309875" Message-ID: <5035E77A.4010107@intel.com> Date: Thu, 23 Aug 2012 16:19:06 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111229 Thunderbird/9.0 MIME-Version: 1.0 To: Ingo Molnar CC: Matthew Garrett , Arjan van de Ven , Peter Zijlstra , 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 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> <20120822091013.GB23336@gmail.com> In-Reply-To: <20120822091013.GB23336@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1054 Lines: 36 On 08/22/2012 05:10 PM, Ingo Molnar wrote: > > * 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. Sure. we'd better make ideas into code, and then let benchmarks and data speaking. > > 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/