From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756447AbZC0J7r (ORCPT ); Fri, 27 Mar 2009 05:59:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752231AbZC0J7j (ORCPT ); Fri, 27 Mar 2009 05:59:39 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:56728 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752153AbZC0J7i (ORCPT ); Fri, 27 Mar 2009 05:59:38 -0400 Date: Fri, 27 Mar 2009 09:58:52 +0000 From: Alan Cox To: Andrew Morton Cc: Linus Torvalds , Theodore Tso , David Rees , Jesper Krogh , Linux Kernel Mailing List Subject: Re: Linux 2.6.29 Message-ID: <20090327095852.09c41a43@lxorguk.ukuu.org.uk> In-Reply-To: <20090326171148.9bf8f1ec.akpm@linux-foundation.org> References: <49C87B87.4020108@krogh.cc> <72dbd3150903232346g5af126d7sb5ad4949a7b5041f@mail.gmail.com> <49C88C80.5010803@krogh.cc> <72dbd3150903241200v38720ca0x392c381f295bdea@mail.gmail.com> <20090325183011.GN32307@mit.edu> <20090325220530.GR32307@mit.edu> <20090326171148.9bf8f1ec.akpm@linux-foundation.org> X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > userspace can do it quite easily. Run a self-tuning script after > installation and when the disk hardware changes significantly. Which is "all the time" in some configurations. It really needs to be self tuning internally based on the observed achieved rates (just as you don't use a script to tune your network bandwidth each day)