Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965036AbVLVCgn (ORCPT ); Wed, 21 Dec 2005 21:36:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965037AbVLVCgn (ORCPT ); Wed, 21 Dec 2005 21:36:43 -0500 Received: from smtp109.plus.mail.mud.yahoo.com ([68.142.206.242]:50615 "HELO smtp109.plus.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S965036AbVLVCgn (ORCPT ); Wed, 21 Dec 2005 21:36:43 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=vhogkk7/qXo5izHIHpzfwVSZRbHwuYDjCq1keUQP71IgqC62H0XzZqVLo8p0krtRC1Lt8EocEYBhBN2NF1nbTahD7an3vpJv9BhJRgHWu/7AAEJlnmsvfVdFI1GtbpH4/V4eX1zbqBKZ5aXuLA11ILK4rxe3lxriu78o9WO8CTI= ; Message-ID: <43AA1134.7090704@yahoo.com.au> Date: Thu, 22 Dec 2005 13:36:36 +1100 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Jes Sorensen CC: Ingo Molnar , Linus Torvalds , lkml , Andrew Morton , Arjan van de Ven , Zwane Mwaikambo , Oleg Nesterov , David Howells , Alan Cox , Benjamin LaHaise , Steven Rostedt , Christoph Hellwig , Andi Kleen , Russell King , Nicolas Pitre Subject: Re: [patch 0/8] mutex subsystem, ANNOUNCE References: <20051221155411.GA7243@elte.hu> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1793 Lines: 50 Jes Sorensen wrote: >>>>>>"Ingo" == Ingo Molnar writes: > > > Ingo> this is the latest version of the mutex subsystem > Ingo> patch-queue. It consists of the following patches: > > [snip] > > Ingo> the patches are against Linus' latest tree, and were tested on > Ingo> i386, x86_64 and ia64. [the tests were also done in > Ingo> DEBUG_MUTEX_FULL mode, to make sure the code works > Ingo> fine. MUTEX_FULL support is not included in this patchqueue]. > > Hi, > > I have been working with Ingo on porting this to ehe ia64 and run a > bunch of benchmarks using the DEBUG_MUTEX_FULL settings to see how it > behaves on various sized systems (8, 24 and 60 CPUs). In general I am > seeing speedups of roughly a factor 4 on XFS and 2.4 on TMPFS. > > Below you will find the results. It's basically the same kernel > version with and without the mutex patch running in DEBUG_MUTEX_FULL > mode without debugging enabled. No other config options were changed. > > I won't rule out any pilot errors, but at least it gives an idea about > the change in performance for a specific workload on different sized > boxes. > It would be nice to first do a run with a fair implementation of mutexes. The improvements are definitely large enough that you cannot dismiss the unfair implementation... I wonder if you can record a maximum cost per op? That would be more interesting than either average or standard deviation. Thanks, Nick -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - 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/