From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751183AbWGGF07 (ORCPT ); Fri, 7 Jul 2006 01:26:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751185AbWGGF07 (ORCPT ); Fri, 7 Jul 2006 01:26:59 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:47780 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S1751183AbWGGF06 (ORCPT ); Fri, 7 Jul 2006 01:26:58 -0400 Date: Thu, 6 Jul 2006 22:26:32 -0700 From: Paul Jackson To: "Siddha, Suresh B" Cc: suresh.b.siddha@intel.com, vatsa@in.ibm.com, nickpiggin@yahoo.com.au, mingo@elte.hu, hawkes@sgi.com, dino@in.ibm.com, akpm@osdl.org, linux-kernel@vger.kernel.org, ak@suse.de Subject: Re: [PATCH 2.6.16-mm1 2/2] sched_domains: Allocate sched_groups dynamically Message-Id: <20060706222632.2e403bd1.pj@sgi.com> In-Reply-To: <20060706173607.F13512@unix-os.sc.intel.com> References: <20060325082804.GB17011@in.ibm.com> <20060706170151.cdb1dc6c.pj@sgi.com> <20060706170824.E13512@unix-os.sc.intel.com> <20060706173417.e7d1e39e.pj@sgi.com> <20060706173607.F13512@unix-os.sc.intel.com> Organization: SGI X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.3; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Suresh wrote: > It is quite possible that the kernel you are testing doesn't have multi-core > scheduler domain. If so, then you may not run into this issue. Aha - we have a winner. CONFIG_SCHED_MC was not enabled in this kernel. Now what I see matches what it should. On a Hyper-Thread (but not Multi-Core) x86_64 system that I tested with CONFIG_SCHED_MC enabled, your patch was required to keep single-cpu cpu_exclusive cpusets from instantly locking up the system. On a Multi-Core (but not Hyper-Thread) IA64 Montecito system that did -not- have CONFIG_SCHED_MC enabled, there is no such problem with single-cpu cpu_exclusive cpusets in the first place. It worked ok, even without the patch. Thank-you. -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.925.600.0401