From: =?utf-8?B?SsO2cm4=?= Engel Subject: Re: [RFC] Heads up on sys_fallocate() Date: Wed, 7 Mar 2007 12:30:16 +0100 Message-ID: <20070307113016.GC15583@lazybastard.org> References: <1172788855.26078.294.camel@edge> <20070301145256.3e999932.akpm@linux-foundation.org> <45E86CBA.3070905@us.ibm.com> <20070305122742.GA11486@atrey.karlin.mff.cuni.cz> <45EC7773.7020603@us.ibm.com> <20070306072850.GA23081@infradead.org> <45ED7C59.4050508@redhat.com> <20070306145009.GB3661@duck.suse.cz> <45EDB19A.6030103@redhat.com> <20070307085135.GB29373@duck.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Eric Sandeen , Ulrich Drepper , Christoph Hellwig , Mingming Cao , Andrew Morton , nscott@aconex.com, "Amit K. Arora" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, suparna@in.ibm.com, alex@clusterfs.com, suzuki@in.ibm.com To: Jan Kara Return-path: Received: from lazybastard.de ([212.112.238.170]:55714 "EHLO longford.lazybastard.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751067AbXCGLkq (ORCPT ); Wed, 7 Mar 2007 06:40:46 -0500 Content-Disposition: inline In-Reply-To: <20070307085135.GB29373@duck.suse.cz> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Wed, 7 March 2007 09:51:35 +0100, Jan Kara wrote: > > I'll probably first write some userspace fs-reorganizer to find out= how > much these changes in layout are able to give you in performance (i.e= =2E > whether it's worth the effort of more complicated kernel online > defragmenter). Have tried profiling the read accesses and prereading them asynchronously on startup? That appears to have improved E17 a lot. See http://lca2007.linux.org.au/talk/101 (and watch the video). J=C3=B6rn --=20 The competent programmer is fully aware of the strictly limited size of his own skull; therefore he approaches the programming task in full humility, and among other things he avoids clever tricks like the plagu= e. -- Edsger W. Dijkstra