Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756508AbXFUMc7 (ORCPT ); Thu, 21 Jun 2007 08:32:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753499AbXFUMcw (ORCPT ); Thu, 21 Jun 2007 08:32:52 -0400 Received: from ecfrec.frec.bull.fr ([129.183.4.8]:41329 "EHLO ecfrec.frec.bull.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752888AbXFUMcv (ORCPT ); Thu, 21 Jun 2007 08:32:51 -0400 Message-ID: <467A7113.7040307@bull.net> Date: Thu, 21 Jun 2007 14:37:39 +0200 From: Nadia Derbey Organization: BULL/DT/OSwR&D/Linux User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040115 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Dave Jones Cc: Andrew Morton , tim.c.chen@linux.intel.com, linux-kernel@vger.kernel.org, Linus Torvalds Subject: Re: Change in default vm_dirty_ratio References: <1182201271.4883.22.camel@localhost.localdomain> <20070618164711.9de1c38e.akpm@linux-foundation.org> <20070620042434.GC12096@redhat.com> In-Reply-To: <20070620042434.GC12096@redhat.com> X-MIMETrack: Itemize by SMTP Server on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 21/06/2007 14:36:45, Serialize by Router on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 21/06/2007 14:36:47, Serialize complete at 21/06/2007 14:36:47 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1585 Lines: 39 Dave Jones wrote: > On Mon, Jun 18, 2007 at 04:47:11PM -0700, Andrew Morton wrote: > > > Frankly, I find it very depressing that the kernel defaults matter. These > > things are trivially tunable and you'd think that after all these years, > > distro initscripts would be establishing the settings, based upon expected > > workload, amount of memory, number and bandwidth of attached devices, etc. > > "This is hard, lets make it someone else's problem" shouldn't ever be the > answer, especially if the end result is that we become even more > dependant on bits of userspace running before the system becomes useful. > > > Heck, there should even be userspace daemons which observe ongoing system > > behaviour and which adaptively tune these things to the most appropriate > > level. > > > > But nope, nothing. > > See the 'libtune' crack that people have been trying to get distros to > adopt for a long time. > If we need some form of adaptive behaviour, the kernel needs to be > doing this monitoring/adapting, not some userspace daemon that may > not get scheduled before its too late. > I'm wondering whether AKT I proposed a couple of months ago wouldn't be more appropriate (provided that we find the perfect heuristics to tune the dirty_ratio ;-) ) see thread http://lkml.org/lkml/2007/1/16/16 Regards, Nadia - 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/