From owner-freebsd-fs@FreeBSD.ORG Wed Sep 27 18:51:13 2006 Return-Path: X-Original-To: freebsd-fs@FreeBSD.ORG Delivered-To: freebsd-fs@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3B6FC16A403 for ; Wed, 27 Sep 2006 18:51:13 +0000 (UTC) (envelope-from anderson@centtech.com) Received: from mh1.centtech.com (moat3.centtech.com [64.129.166.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id E0C5C43D46 for ; Wed, 27 Sep 2006 18:51:12 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [10.177.171.220] (neutrino.centtech.com [10.177.171.220]) by mh1.centtech.com (8.13.1/8.13.1) with ESMTP id k8RIpBrZ031166; Wed, 27 Sep 2006 13:51:11 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <451AC81E.5070803@centtech.com> Date: Wed, 27 Sep 2006 13:51:10 -0500 From: Eric Anderson User-Agent: Thunderbird 1.5.0.7 (X11/20060923) MIME-Version: 1.0 To: Oliver Fromme References: <200609271744.k8RHipTS032655@lurza.secnetix.de> In-Reply-To: <200609271744.k8RHipTS032655@lurza.secnetix.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.87.1/1948/Wed Sep 27 11:03:03 2006 on mh1.centtech.com X-Virus-Status: Clean Cc: freebsd-fs@FreeBSD.ORG Subject: Re: Hi: Porting Cramfs on FreeBSD X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Sep 2006 18:51:13 -0000 On 09/27/06 12:44, Oliver Fromme wrote: > Eric Anderson wrote: > > I'm currently working on a tarfs, that will do something similar to > > this, except it allows you to use a regular tar file as the file system > > image. > > That's cool. I'm looking forward to it. > > > I don't have compression working yet, but that is on the > > roadmap. [...] large file system sizes (based on available > > memory) > > Hm. Does that mean that the whole (uncompressed) FS image > will have to fit into memory? That would be a disadvantage > compared to cramfs. Cramfs doesn't compress the whole FS > as one object (like .tar.gz), but it compresses it page-by- > page, so every page can be uncompressed independently, and > memory usage is very low, which is good for small embedded > applications. No, only inode+direntries need to fit into memory. So an FS with 1million inodes might take .5MB of memory (estimate). Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------