From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762949AbYF3NVI (ORCPT ); Mon, 30 Jun 2008 09:21:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932184AbYF3NP3 (ORCPT ); Mon, 30 Jun 2008 09:15:29 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:55505 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932173AbYF3NP1 (ORCPT ); Mon, 30 Jun 2008 09:15:27 -0400 Date: Mon, 30 Jun 2008 15:15:11 +0200 From: Ingo Molnar To: Gregory Haskins Cc: peterz@infradead.org, npiggin@suse.de, rostedt@goodmis.org, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: Re: [PATCH 0/3] sched: newidle and RT wake-buddy fixes Message-ID: <20080630131511.GA7506@elte.hu> References: <20080627202444.3829.21595.stgit@lsg.lsg.lab.novell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080627202444.3829.21595.stgit@lsg.lsg.lab.novell.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 * Gregory Haskins wrote: > Hi Ingo, > The following patches apply to linux-tip/sched/devel and enhance the > performance of the kernel (specifically in PREEMPT_RT, though they do > not regress mainline performance as far as I can tell). They offer > somewhere between 50-100% speedups in netperf performance, depending > on the test. -tip testing found this boot hang: Linux version 2.6.26-rc8-tip (mingo@dione) (gcc version 4.2.3) #12917 SMP Mon Jun 30 15:06:32 CEST 2008 [...] CPU 1/1 -> Node 0 CPU: Physical Processor ID: 0 CPU: Processor Core ID: 1 CPU1: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ stepping 02 Brought up 2 CPUs Total of 2 processors activated (8041.15 BogoMIPS). [ hard hang ] with this config: http://redhat.com/~mingo/misc/config-Mon_Jun_30_14_54_19_CEST_2008.bad full bootlog: http://redhat.com/~mingo/misc/hang-Mon_Jun_30_14_54_19_CEST_2008.bad it should continue with this bootup sequence: calling net_ns_init+0x0/0x1a0 net_namespace: 376 bytes initcall net_ns_init+0x0/0x1a0 returned 0 after 0 msecs calling init_smp_flush+0x0/0x60 i've bisected it down to: -------------- | commit cc8160c56843201891766660e3816d2e546c1b17 | Author: Gregory Haskins | Date: Fri Jun 27 14:29:50 2008 -0600 | | sched: enable interrupts and drop rq-lock during newidle balancing -------------- so i've reverted that change for now. Ingo