From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263376AbTJOPFw (ORCPT ); Wed, 15 Oct 2003 11:05:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263378AbTJOPFw (ORCPT ); Wed, 15 Oct 2003 11:05:52 -0400 Received: from thebsh.namesys.com ([212.16.7.65]:40351 "HELO thebsh.namesys.com") by vger.kernel.org with SMTP id S263376AbTJOPFf (ORCPT ); Wed, 15 Oct 2003 11:05:35 -0400 From: Nikita Danilov MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16269.25149.823749.941199@laputa.namesys.com> Date: Wed, 15 Oct 2003 19:05:33 +0400 To: Erik Bourget Cc: Josh Litherland , linux-kernel@vger.kernel.org Subject: Re: Transparent compression in the FS In-Reply-To: <87wub6o8vl.fsf@loki.odinnet> References: <1066163449.4286.4.camel@Borogove> <20031015133305.GF24799@bitwizard.nl> <16269.20654.201680.390284@laputa.namesys.com> <20031015142738.GG24799@bitwizard.nl> <87wub6o8vl.fsf@loki.odinnet> X-Mailer: ed | telnet under Fuzzball OS, emulated on Emacs 21.5 (beta14) "cassava" XEmacs Lucid Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Erik Bourget writes: > Erik Mouw writes: > > > On Wed, Oct 15, 2003 at 05:50:38PM +0400, Nikita Danilov wrote: > >> Erik Mouw writes: > >> > Nowadays disks are so incredibly cheap, that transparent compression > >> > support is not realy worth it anymore (IMHO). > >> > >> But disk bandwidth is so incredibly expensive that compression becoming > >> more and more useful: on compressed file system bandwidth of user-data > >> transfers can be larger than raw disk bandwidth. It is the same > >> situation as with allocation of disk space for files: disks are cheap, > >> but storing several files in the same block becomes more advantageous > >> over time. > > > > You have a point, but remember that modern IDE drives can do about > > 50MB/s from medium. I don't think you'll find a CPU that is able to > > handle transparent decompression on the fly at 50MB/s, even not with a > > simple compression scheme as used in NTFS (see the NTFS docs on > > SourceForge for details). > > > > Erik > > > > PS: let me guess: among other things, reiser4 comes with transparent > > compression? ;-) > > Reiser4 made my coffee this morning, it's wonderful :) > > Seriously, though, (and getting off the topic), has anyone started to use > reiser4 in a high-load environment? I've got a mail system that shoots a few > million messages through it every day and a filesystem that's faster with > creating and deleting tons of ~4kb qmail queue files (with data journaling!) > would be verrry innnteresting. Please, don't use reiser4 in production environments. It is still in the late debugging stage. Stay tuned, as they say. :) > > - Erik Bourget > Nikita.