From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by ug-out-1314.google.com with SMTP id c2so646169ugf for ; Sun, 05 Aug 2007 06:23:19 -0700 (PDT) Date: Sun, 5 Aug 2007 15:22:31 +0200 From: Diego Calleja Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-Id: <20070805152231.aba9428a.diegocg@gmail.com> In-Reply-To: <20070805071320.GC515@elte.hu> References: <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <46B4C0A8.1000902@garzik.org> <20070804191205.GA24723@lazybastard.org> <20070804192130.GA25346@elte.hu> <20070804211156.5f600d80@the-village.bc.nu> <20070804202830.GA4538@elte.hu> <20070804224834.5187f9b7@the-village.bc.nu> <20070805071320.GC515@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: owner-linux-mm@kvack.org Return-Path: To: Ingo Molnar Cc: Alan Cox , J??rn Engel , 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 List-ID: El Sun, 5 Aug 2007 09:13:20 +0200, Ingo Molnar escribio: > Measurements show that noatime helps 20-30% on regular desktop > workloads, easily 50% for kernel builds and much more than that (in > excess of 100%) for file-read-intense workloads. We cannot just walk And as everybody knows in servers is a popular practice to disable it. According to an interview to the kernel.org admins.... "Beyond that, Peter noted, "very little fancy is going on, and that is good because fancy is hard to maintain." He explained that the only fancy thing being done is that all filesystems are mounted noatime meaning that the system doesn't have to make writes to the filesystem for files which are simply being read, "that cut the load average in half." I bet that some people would consider such performance hit a bug... -- 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