From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 25 Sep 2001 09:17:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 25 Sep 2001 09:17:10 -0400 Received: from krusty.E-Technik.Uni-Dortmund.DE ([129.217.163.1]:58382 "HELO krusty.e-technik.uni-dortmund.de") by vger.kernel.org with SMTP id convert rfc822-to-8bit; Tue, 25 Sep 2001 09:16:58 -0400 Date: Tue, 25 Sep 2001 15:17:21 +0200 From: Matthias Andree To: linux-kernel@vger.kernel.org, reiserfs-list@namesys.com Subject: Re: [PATCH] 2.4.10 improved reiserfs a lot, but could still be better Message-ID: <20010925151721.C9890@emma1.emma.line.org> Mail-Followup-To: linux-kernel@vger.kernel.org, reiserfs-list@namesys.com In-Reply-To: <20010924173210.A7630@emma1.emma.line.org> <20010924161518.KYHD11251.femail27.sdc1.sfba.home.com@there> <3BB07EA2.4010804@juridicas.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <3BB07EA2.4010804@juridicas.com> User-Agent: Mutt/1.3.22.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Could you please only quote the relevant parts, particularly, would you erase deeper nesting of quotes in your replies? That'd help a lot of people transfer less data they can still easily get from their own mailer at a keypress. Thanks a lot. On Tue, 25 Sep 2001, Jorge Nerín wrote: > Who says test.zero is a linear file and it's not scattered around the > whole disk and the fs layer is filling holes...? If it's the case the > write cache is a BIG win, just think that the fs writes a chunk at the > beggining of the disk, then another chunk at the end, then another near > the beginning, then... you get the picture, in this case the disk > reorders the seeks to best fit. > > If you want to try a REAL linear write do a dd if=/dev/zero of=/dev/hde7 > or whatever unused partition you have. I did, and it showed almost the same behaviour, twice as fast with write cache turned on. Scattering the writes would (usually) only happen on a nearly filled disk.