From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 4 Aug 2007 19:17:24 +0200 From: Ingo Molnar Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070804171724.GA4740@elte.hu> References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <20070804190210.8b1530dd.diegocg@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20070804190210.8b1530dd.diegocg@gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Diego Calleja Cc: Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, 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 List-ID: * Diego Calleja wrote: > El Sat, 4 Aug 2007 18:37:33 +0200, Ingo Molnar escribio: > > > thousands of applications. So for most file workloads we give > > Windows a 20%-30% performance edge, for almost nothing. (for > > RAM-starved kernel builds the performance difference between atime > > and noatime+nodiratime setups is more on the order of 40%) > > Just curious - do you have numbers with relatime? nope. Stupid question, i just tried it and got this: EXT3-fs: Unrecognized mount option "relatime" or missing value i've got util-linux-2.13-0.46.fc6 and 2.6.22 on that box, shouldnt that be recent enough? As far as i can see it from the kernel-side code, this works on the general VFS level and hence should be supported by ext3 already. even relatime means one extra write IO after a file has been created, but at least for read-mostly files it avoids the continuous atime update. Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org