Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262373AbTIEKGP (ORCPT ); Fri, 5 Sep 2003 06:06:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262381AbTIEKGP (ORCPT ); Fri, 5 Sep 2003 06:06:15 -0400 Received: from [195.39.17.254] ([195.39.17.254]:640 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S262373AbTIEKGO (ORCPT ); Fri, 5 Sep 2003 06:06:14 -0400 Date: Fri, 5 Sep 2003 12:06:07 +0200 From: Pavel Machek To: "Eric W. Biederman" Cc: Mike Fedyk , Ed Sweetman , Alex Tomas , linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net Subject: Re: [Ext2-devel] Re: [RFC] extents support for EXT3 Message-ID: <20030905100607.GA220@elf.ucw.cz> References: <3F4F7D56.9040107@wmich.edu> <3F4F923F.9070207@wmich.edu> <3F4FAFA2.4080202@wmich.edu> <20030829213940.GC3846@matchmail.com> <3F4FD2BE.1020505@wmich.edu> <20030829231726.GE3846@matchmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.3i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1147 Lines: 28 Hi! > > > you get no real slowdown as far as rough benchmarks are concerned, > > > perhaps with a microbenchmark you would see one and also, doesn't it > > > take up more space to save the extent info and such? Either way, all of > > > it's real benefits occur on large files. > > > > IIRC, if your blocks are contiguous, you can save as soon as soon as the > > file size goes above one block (witout extents, the first 12 blocks are > > pointed to by what? I forget... :-/ ) > > They are pointed to directly from the inode. > > In light of other concerns how reasonable is a switch to e2fsck that > will remove extents so people can downgrade filesystems? It is going to be non-trivial: downgrading filesystem will likely need free space. And now: what happens when there's no free space? Pavel -- When do you have a heart between your knees? [Johanka's followup: and *two* hearts?] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/