From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935608AbXG2VRa (ORCPT ); Sun, 29 Jul 2007 17:17:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S936419AbXG2VRG (ORCPT ); Sun, 29 Jul 2007 17:17:06 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:56075 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936353AbXG2VQ7 (ORCPT ); Sun, 29 Jul 2007 17:16:59 -0400 Date: Sun, 29 Jul 2007 23:16:44 +0200 From: Ingo Molnar To: "Siddha, Suresh B" Cc: npiggin@suse.de, linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: Re: [patch] sched: introduce SD_BALANCE_FORK for ht/mc/smp domains Message-ID: <20070729211644.GC6808@elte.hu> References: <20070726183225.GJ3318@linux-os.sc.intel.com> <20070726221830.GA4113@elte.hu> <20070726223455.GK3318@linux-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070726223455.GK3318@linux-os.sc.intel.com> User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7-deb -1.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Siddha, Suresh B wrote: > They might be doing more exec's and probably covered by exec balance. > > There was a small pthread test case which was calculating the time to > create all the threads and how much time each thread took to start > running. It appeared as if the threads ran sequentially one after > another on a DP system with four cores leading to this SD_BALANCE_FORK > observation. would be nice to dig out that testcase i suspect and quantify the benefits of your patch. Another workload which might perform better would be linpack: it benefits from fast and immediate 'spreading' of freshly forked threads. Ingo