From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756281AbYA2MM0 (ORCPT ); Tue, 29 Jan 2008 07:12:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751273AbYA2MMQ (ORCPT ); Tue, 29 Jan 2008 07:12:16 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:43998 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750727AbYA2MMP (ORCPT ); Tue, 29 Jan 2008 07:12:15 -0500 Date: Tue, 29 Jan 2008 06:12:02 -0600 From: Paul Jackson To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, vatsa@linux.vnet.ibm.com, dhaval@linux.vnet.ibm.com, nickpiggin@yahoo.com.au, ebiederm@xmission.com, akpm@linux-foundation.org, sgrubb@redhat.com, rostedt@goodmis.org, ghaskins@novell.com, dmitry.adamushko@gmail.com, tong.n.li@intel.com, tglx@linutronix.de, menage@google.com, rientjes@google.com Subject: Re: scheduler scalability - cgroups, cpusets and load-balancing Message-Id: <20080129061202.95b66041.pj@sgi.com> In-Reply-To: <1201607401.28547.124.camel@lappy> References: <1201600428.28547.87.camel@lappy> <1201604243.28547.101.camel@lappy> <20080129053005.bc7a11d7.pj@sgi.com> <1201607401.28547.124.camel@lappy> Organization: SGI X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.12.0; 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter, replying to Paul: > > 3) you turn off sched_load_balance in that realtime cpuset. > > Ah, I don't think 3 is needed. Quite to the contrary, there is quite a > large body of research work covering the scheduling of (hard and soft) > realtime tasks on multiple cpus. Well, the way it's coded now, the user space code needs to do (3), because that's the only way they get the system to have anything other than one big fat sched domain covering the all the CPUs in the system. Actually ... I need a picture of a bunny with a pancake hat here, as I have no idea what you just said ;). -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.940.382.4214