Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755597AbZCDReL (ORCPT ); Wed, 4 Mar 2009 12:34:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753673AbZCDRd6 (ORCPT ); Wed, 4 Mar 2009 12:33:58 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:47536 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753620AbZCDRd5 (ORCPT ); Wed, 4 Mar 2009 12:33:57 -0500 Date: Wed, 4 Mar 2009 18:33:21 +0100 From: Ingo Molnar To: Arun R Bharadwaj Cc: linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org, a.p.zijlstra@chello.nl, ego@in.ibm.com, tglx@linutronix.de, andi@firstfloor.org, venkatesh.pallipadi@intel.com, vatsa@linux.vnet.ibm.com, arjan@infradead.org, svaidy@linux.vnet.ibm.com Subject: Re: [v2 PATCH 0/4] timers: framework for migration between CPU Message-ID: <20090304173321.GB25962@elte.hu> References: <20090304121249.GA9855@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090304121249.GA9855@linux.vnet.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: 1686 Lines: 44 * Arun R Bharadwaj wrote: > $taskset -c 4,5,6,7 make -j4 > > my_driver queuing timers continuously on CPU 10. > > idle load balancer currently on CPU 15 > > > Case1: Without timer migration Case2: With timer migration > > -------------------- -------------------- > | Core | LOC Count | | Core | LOC Count | > | 4 | 2504 | | 4 | 2503 | > | 5 | 2502 | | 5 | 2503 | > | 6 | 2502 | | 6 | 2502 | > | 7 | 2498 | | 7 | 2500 | > | 10 | 2501 | | 10 | 35 | > | 15 | 2501 | | 15 | 2501 | > -------------------- -------------------- > > --------------------- -------------------- > | Core | Sleep time | | Core | Sleep time | > | 4 | 0.47168 | | 4 | 0.49601 | > | 5 | 0.44301 | | 5 | 0.37153 | > | 6 | 0.38979 | | 6 | 0.51286 | > | 7 | 0.42829 | | 7 | 0.49635 | > | 10 | 9.86652 | | 10 | 10.04216 | > | 15 | 0.43048 | | 15 | 0.49056 | > --------------------- --------------------- > > Here, all the timers queued by the driver on CPU10 are moved to CPU15, > which is the idle load balancer. The numbers with this automatic method based on the ilb-cpu look pretty convincing. Is this what you expected it to be? 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/