Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765399AbXHDWj4 (ORCPT ); Sat, 4 Aug 2007 18:39:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763020AbXHDWjr (ORCPT ); Sat, 4 Aug 2007 18:39:47 -0400 Received: from courier.cs.helsinki.fi ([128.214.9.1]:55718 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762904AbXHDWjq (ORCPT ); Sat, 4 Aug 2007 18:39:46 -0400 Date: Sun, 5 Aug 2007 01:39:42 +0300 (EEST) From: "=?ISO-8859-1?Q?Ilpo_J=E4rvinen?=" X-X-Sender: ijjarvin@kivilampi-30.cs.helsinki.fi 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 Subject: Re: [PATCH 00/23] per device dirty throttling -v8 In-Reply-To: <20070804202830.GA4538@elte.hu> Message-ID: References: <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1984 Lines: 39 On Sat, 4 Aug 2007, Ingo Molnar wrote: > * Alan Cox wrote: > > > People just need to know about the performance differences - very few > > realise its more than a fraction of a percent. I'm sure Gentoo will > > use relatime the moment anyone knows its > 5% 8) > > noatime,nodiratime gave 50% of wall-clock kernel rpm build performance > improvement for Dave Jones, on a beefy box. Unless i misunderstood what > you meant under 'fraction of a percent' your numbers are _WAY_ off. > Atime updates are a _huge everyday deal_, from laptops to servers. > Everywhere on the planet. Give me a Linux desktop anywhere and i can > tell you whether it has atimes on or off, just by clicking around and > using apps (without looking at the mount options). That's how i notice > it that i forgot to turn off atime on any newly installed system - the > system has weird desktop lags and unnecessary disk trashing. ...For me, I would say 50% is not enough to describe the _visible_ benefits... Not talking any specific number but past 10sec-1min+ lagging in X is history, it's gone and I really don't miss it that much... :-) Cannot reproduce even a second long delay anymore in window focusing under considerable load as it's basically instantaneous (I can see that it's loaded but doesn't affect the feeling of responsiveness I'm now getting), even on some loads that I couldn't previously even dream of... I still can get drawing lag a bit by pushing enough stuff to swap but still it's definately quite well under control, though rare 1-2 sec spikes in drawing appear due to swap loads I think. ...And this is 2.6.21.5 so no fancies ala Ingo's CFS or so yet... ...Thanks about this hint. :-) -- i. - 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/