From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267528AbUHSXmS (ORCPT ); Thu, 19 Aug 2004 19:42:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267529AbUHSXmS (ORCPT ); Thu, 19 Aug 2004 19:42:18 -0400 Received: from bi01p1.co.us.ibm.com ([32.97.110.142]:56728 "EHLO linux.local") by vger.kernel.org with ESMTP id S267528AbUHSXmQ (ORCPT ); Thu, 19 Aug 2004 19:42:16 -0400 Date: Thu, 19 Aug 2004 16:38:37 -0700 From: "Paul E. McKenney" To: Jesse Barnes Cc: "Martin J. Bligh" , hawkes@sgi.com, linux-kernel@vger.kernel.org, wli@holomorphy.com Subject: Re: kernbench on 512p Message-ID: <20040819233837.GA2723@us.ibm.com> Reply-To: paulmck@us.ibm.com References: <200408191216.33667.jbarnes@engr.sgi.com> <253460000.1092939952@flay> <200408191711.04776.jbarnes@engr.sgi.com> <200408191724.04422.jbarnes@engr.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200408191724.04422.jbarnes@engr.sgi.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 19, 2004 at 05:24:04PM -0400, Jesse Barnes wrote: > On Thursday, August 19, 2004 5:11 pm, Jesse Barnes wrote: > > The output is attached (my mailer insists on wrapping it if I inline it). > > I used 'lockstat -w'. > > The highlights: > > nw spin rjct lock & function > 19.0% 81.0% 0% dcache_lock > 3.3% 96.7% 0% d_alloc+0x270 > 2.7% 97.3% 0% d_delete+0x40 > 18.3% 81.7% 0% d_instantiate+0x90 > 4.7% 95.3% 0% d_move+0x60 > 34.6% 65.4% 0% d_rehash+0xe0 > 19.1% 80.9% 0% dput+0x40 > 10.5% 89.5% 0% link_path_walk+0xef0 > 0% 100% 0% sys_getcwd+0x210 > > 41.4% 58.6% 0% rcu_state > 61.3% 38.7% 0% __rcu_process_callbacks+0x260 > 41.4% 58.6% 0% rcu_check_quiescent_state+0xf0 > > So it looks like the dcache lock is the biggest problem on this system with > this load. And although the rcu stuff has improved tremendously for this > system, it's still highly contended. Was this run using all of Manfred's RCU patches? If not, it would be interesting to see what you get with full RCU_HUGE patchset. Thanx, Paul