Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756981Ab3CERKe (ORCPT ); Tue, 5 Mar 2013 12:10:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34437 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753547Ab3CERKd (ORCPT ); Tue, 5 Mar 2013 12:10:33 -0500 Message-ID: <513626E9.2040509@redhat.com> Date: Tue, 05 Mar 2013 12:10:01 -0500 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Davidlohr Bueso CC: Linus Torvalds , Emmanuel Benisty , "Vinod, Chegu" , "Low, Jason" , Peter Zijlstra , "H. Peter Anvin" , Andrew Morton , aquini@redhat.com, Michel Lespinasse , Ingo Molnar , Larry Woodman , Linux Kernel Mailing List , Steven Rostedt , Thomas Gleixner Subject: Re: [PATCH v2 0/4] ipc: reduce ipc lock contention References: <1362476149.2225.50.camel@buesod1.americas.hpqcorp.net> In-Reply-To: <1362476149.2225.50.camel@buesod1.americas.hpqcorp.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1143 Lines: 34 On 03/05/2013 04:35 AM, Davidlohr Bueso wrote: > 2) While on an Oracle swingbench DSS (data mining) workload the > improvements are not as exciting as with Rik's benchmark, we can see > some positive numbers. For an 8 socket machine the following are the > percentages of %sys time incurred in the ipc lock: > > Baseline (3.9-rc1): > 100 swingbench users: 8,74% > 400 swingbench users: 21,86% > 800 swingbench users: 84,35% > > With this patchset: > 100 swingbench users: 8,11% > 400 swingbench users: 19,93% > 800 swingbench users: 77,69% Does the swingbench DSS workload use multiple semaphores, or just one? Your patches look like a great start to make the semaphores more scalable. If the swingbench DSS workload uses multiple semaphores, I have ideas for follow-up patches to make things scale better. What does ipcs output look like while running swingbench DSS? -- All rights reversed -- 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/