Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761687AbXKPWMS (ORCPT ); Fri, 16 Nov 2007 17:12:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757048AbXKPWMH (ORCPT ); Fri, 16 Nov 2007 17:12:07 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:47266 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757310AbXKPWMG (ORCPT ); Fri, 16 Nov 2007 17:12:06 -0500 Date: Fri, 16 Nov 2007 14:12:04 -0800 (PST) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: Micah Dowty cc: Ingo Molnar , Kyle Moffett , Cyrus Massoumi , LKML Kernel , Andrew Morton , Mike Galbraith , Paul Menage , Dmitry Adamushko , Peter Williams Subject: Re: High priority tasks break SMP balancer? In-Reply-To: <20071116104801.GA4585@vmware.com> Message-ID: References: <20071110001103.GD16250@vmware.com> <2FAA6826-653E-482F-A037-C539BAEEA1DA@mac.com> <20071115191408.GA4914@vmware.com> <20071115202425.GC4914@vmware.com> <20071115213510.GA16079@vmware.com> <20071116024408.GA20322@vmware.com> <20071116060700.GD16273@elte.hu> <20071116104801.GA4585@vmware.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 903 Lines: 27 On Fri, 16 Nov 2007, Micah Dowty wrote: > 2.6.17 - > 2.6.19 - > 2.6.19.7 - > 2.6.20 + > 2.6.21 + > 2.6.22 - > 2.6.23.1 + > > Here a "-" means that the problem does not occur (my test program uses > 100% of both CPUs) and a "+" means that the test program leaves one > CPU mostly idle. > > Unless I've made a mistake, 2.6.22 seems like the outlier rather than > 2.6.23. Is this inconsistent with the scheduler tick hypothesis? Siddha fixed an issue with the jiffy accounting in for the softirq approach in.22 (vague recall maybe not exactly that version). This may be consistent with an issue that was fixed and now surfaces because of something else. - 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/