From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761319AbYDAVDO (ORCPT ); Tue, 1 Apr 2008 17:03:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760344AbYDAVBX (ORCPT ); Tue, 1 Apr 2008 17:01:23 -0400 Received: from main.gmane.org ([80.91.229.2]:42886 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760371AbYDAVBW (ORCPT ); Tue, 1 Apr 2008 17:01:22 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Matthieu CASTET Subject: Re: [RFC PATCH] UBIFS - new flash file system Date: Tue, 1 Apr 2008 21:01:09 +0000 (UTC) Message-ID: References: <1206629746-4298-1-git-send-email-Artem.Bityutskiy@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: main.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 81.57.151.96 (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.13) Gecko/20080313 Iceape/1.1.9 (Debian-1.1.9-1)) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >Artem Bityutskiy nokia.com> writes: Hi, thanks for this new file system > UBIFS is stable and very close to be production ready. It was > tested on OLPC and N810. The development was done on flash simulator > on a 2-way x86 machine. However, UBIFS needs a good review. Did you have a chance of testing it with various real flash : old small page nand flash, very big large page NAND (4GB), ... > UBIFS mount time is considerably faster as well. For example, > In case of OLPC we observed 10-15 seconds faster boot time > comparing to JFFS2 (fast mount, no full media check). May be you could update your benchmark : http://osl.sed.hu/wiki/ubifs/index.php/Mount_results doesn't give super result : 1 second mount time on a 64 MB flash with 517.73 BogoMIPS CPU. What will be the result for a 4GB flash ? 64 seconds ? Did you do very intensive and long test where you can see bad block appearing on the flash ? Speaking of big nand, is UBI/UBI-FS free of 2GB/4GB limit ? > UBIFS is quite complex because Is it possible to create small and fast code for read only support in bootloader ? Matthieu