From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270798AbTG0OAa (ORCPT ); Sun, 27 Jul 2003 10:00:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270799AbTG0OAa (ORCPT ); Sun, 27 Jul 2003 10:00:30 -0400 Received: from thebsh.namesys.com ([212.16.7.65]:38859 "HELO thebsh.namesys.com") by vger.kernel.org with SMTP id S270798AbTG0OAT (ORCPT ); Sun, 27 Jul 2003 10:00:19 -0400 Subject: Re: Reiser4 status: benchmarked vs. V3 (and ext3) From: Yury Umanets To: Hans Reiser Cc: Daniel Egger , Nikita Danilov , Linux Kernel Mailinglist , reiserfs mailing list In-Reply-To: <3F23D43C.9080607@namesys.com> References: <3F1EF7DB.2010805@namesys.com> <1059062380.29238.260.camel@sonja> <16160.4704.102110.352311@laputa.namesys.com> <1059093594.29239.314.camel@sonja> <16161.10863.793737.229170@laputa.namesys.com> <1059142851.6962.18.camel@sonja> <1059143985.19594.3.camel@haron.namesys.com> <1059181687.10059.5.camel@sonja> <1059203990.21910.13.camel@haron.namesys.com> <1059228808.10692.7.camel@sonja> <1059231274.28094.40.camel@haron.namesys.com> <3F23D43C.9080607@namesys.com> Content-Type: text/plain Organization: NAMESYS Message-Id: <1059315214.25363.6.camel@haron.namesys.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.3.99 Date: Sun, 27 Jul 2003 18:13:34 +0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2003-07-27 at 17:31, Hans Reiser wrote: > Yury Umanets wrote: > > >On Sat, 2003-07-26 at 18:13, Daniel Egger wrote: > > > > > >>Am Sam, 2003-07-26 um 09.19 schrieb Yury Umanets: > >> > >> > >> > >>>I think this is more then enough for running reiser4. Reiser4 is a linux > >>>filesystem first of all, and linux is able to be ran on even worse > >>>hardware then you have. > >>> > >>> > > > > > > > >>Linux is running just fine one the system, thanks. My question is > >>whether reiserfs is suitable for flash devices. The chances to get some > >>usable answers seem to be incredible low though... > >> > >> > > > >Reiserfs cannot be used efficiently with flash, as it uses block size 4K > >(by default) and usual flash block size is in range 64K - 256K. > > > This answer is incorrect. The device driver will hide this from us, > slum squeezing will tend to write in large batches, and things will > probably work. However, you should try it and see rather than theorize. See my explanation in last emails. Also I have not just theorized. I have been developing block device driver for MPIO players (Smart Card based one). And reiserfs does not use squeezing on flush (and I've spoken about reiserfs here). > > > > >Also reiserfs does not use compression, that would be very nice of it > >:), because flash has limited number of erase cycles per block (in range > >100.000) and it is about three times as expensive as SDRAM. > > > We have compression plugins that will be ready soon. Go ask Edward in > the chair behind you what he does for a living.;-) Yes, we have compression plugins in reiser4, but we have spoken about reiserfs. > > > > >So, it is better to use something more convenient. For instance jffs2. > > > >But, if you are still want to use reiserfs for flash device, you should > >do at least the following: > > > >(1) Make the journal substantial smaller of size. > >(2) Don't turn tails off. This is useful to prolong flash live. > > > > > >Regards. > > > > > > > He is asking about reiser4, not reiserfs V3. -- We're flying high, we're watching the world passes by...