Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752102AbYL3GWA (ORCPT ); Tue, 30 Dec 2008 01:22:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751187AbYL3GVv (ORCPT ); Tue, 30 Dec 2008 01:21:51 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:54065 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751179AbYL3GVu (ORCPT ); Tue, 30 Dec 2008 01:21:50 -0500 Date: Tue, 30 Dec 2008 07:21:39 +0100 From: Ingo Molnar To: Balbir Singh Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Andrew Morton Subject: Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n Message-ID: <20081230062139.GA30038@elte.hu> References: <20081218175313.29812.4781.stgit@drishya.in.ibm.com> <28c262360812291543ia322a13g6af854a685ce7632@mail.gmail.com> <20081230024819.GA23301@balbir.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081230024819.GA23301@balbir.in.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2126 Lines: 52 * Balbir Singh wrote: > > > KERNBENCH Runs: make -j4 on a x86 8 core, dual socket quad core cpu > > > package system > > > > > > SchedMC Run Time Package Idle Energy Power > > > 0 81.68 52.83% 54.71% 1.00x J 1.00y W > > > 1 80.70 36.62% 70.11% 0.95x J 0.96y W > > > 2 74.95 19.53% 85.92% 0.90x J 0.98y W > > Your result is very interesting. > > level 2 is more fast and efficient of power. > > > > What's major contributor to use less time in level 2? > > I think it's cache bounce is less time than old. > > Is right ? > > Yes, correct yes, i too noticed that runtime improved so dramatically: +7.5% on kernbench is a _very_ big deal. So i wanted to ask you to re-test whether this speedup is reproducible, and if yes, please check a few other workloads (for example sysbench on postgresql / mysqld) and send a patch that changes the sched_mc_power_savings default to POWERSAVINGS_BALANCE_WAKEUP (2). Sidenote, _please_ fix your mail client to not mess up the Cc: list via: Mail-Followup-To: MinChan Kim , Vaidyanathan Srinivasan , Linux Kernel , Suresh B Siddha , Venkatesh Pallipadi , Peter Zijlstra , Ingo Molnar , Dipankar Sarma , Vatsa , Gautham R Shenoy , Andi Kleen , David Collier-Brown , Tim Connors , Max Krasnyansky , Gregory Haskins , Pavel Machek , Andrew Morton 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/