Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761905AbXHEUZc (ORCPT ); Sun, 5 Aug 2007 16:25:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758223AbXHEUZV (ORCPT ); Sun, 5 Aug 2007 16:25:21 -0400 Received: from lazybastard.de ([212.112.238.170]:34119 "EHLO longford.lazybastard.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753105AbXHEUZT (ORCPT ); Sun, 5 Aug 2007 16:25:19 -0400 Date: Sun, 5 Aug 2007 22:21:12 +0200 From: =?utf-8?B?SsO2cm4=?= Engel To: Ingo Molnar Cc: Arjan van de Ven , Willy Tarreau , =?utf-8?B?SsO2cm4=?= Engel , Alan Cox , Jeff Garzik , Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, Linux Kernel Mailing List , miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk, david@lang.hm Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070805202112.GA32088@lazybastard.org> References: <20070804192130.GA25346@elte.hu> <20070804211156.5f600d80@the-village.bc.nu> <20070804202830.GA4538@elte.hu> <20070804210351.GA9784@elte.hu> <20070804225121.5c7b66e0@the-village.bc.nu> <20070805072141.GA4414@elte.hu> <20070805085354.GC6002@1wt.eu> <20070805141708.GB25753@lazybastard.org> <1186336953.2777.17.camel@laptopd505.fenrus.org> <20070805183714.GA31606@lazybastard.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20070805183714.GA31606@lazybastard.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2422 Lines: 67 On Sun, 5 August 2007 20:37:14 +0200, Jörn Engel wrote: > > Guess I should throw in a kernel compile test as well, just to get a > feel for the performance. Three runs each of noatime, relatime and atime, both with cold caches and with warm caches. Scripts below. Run on a Thinkpad T40, 1.5GHz, 2GiB RAM, 60GB 2.5" IDE disk, ext3. Biggest difference between atime and noatime (median run, cold cache) is ~2.3%, nowhere near the numbers claimed by Ingo. Ingo, how did you measure 10% and more? noatime, cold cache relatime, cold cache atime, cold cache real 2m10.242s real 2m10.549s real 2m10.388s user 1m46.886s user 1m46.680s user 1m47.000s sys 0m8.243s sys 0m8.423s sys 0m8.239s real 2m11.270s real 2m11.212s real 2m14.280s user 1m46.940s user 1m46.776s user 1m46.670s sys 0m8.139s sys 0m8.283s sys 0m8.503s real 2m11.601s real 2m14.861s real 2m14.335s user 1m46.920s user 1m47.103s user 1m46.846s sys 0m8.246s sys 0m8.266s sys 0m8.349s noatime, warm cache relatime, warm cache atime, warm cache real 1m55.894s real 1m56.053s real 1m56.905s user 1m46.683s user 1m46.600s user 1m46.853s sys 0m8.186s sys 0m8.349s sys 0m8.249s real 1m55.823s real 1m56.093s real 1m57.077s user 1m46.583s user 1m46.913s user 1m46.590s sys 0m8.259s sys 0m7.966s sys 0m8.523s real 1m55.789s real 1m56.214s real 1m57.224s user 1m46.803s user 1m46.753s user 1m46.953s sys 0m8.053s sys 0m8.113s sys 0m8.113s Jörn -- Data expands to fill the space available for storage. -- Parkinson's Law Cold cache script: #!/bin/sh make distclean echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches make allnoconfig time make Warm cache script: #!/bin/sh make distclean make allnoconfig rgrep laksdflkdsaflkadsfja . time make - 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/