Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964953AbVKVO5K (ORCPT ); Tue, 22 Nov 2005 09:57:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964955AbVKVO5K (ORCPT ); Tue, 22 Nov 2005 09:57:10 -0500 Received: from thunk.org ([69.25.196.29]:43757 "EHLO thunker.thunk.org") by vger.kernel.org with ESMTP id S964953AbVKVO5J (ORCPT ); Tue, 22 Nov 2005 09:57:09 -0500 Date: Tue, 22 Nov 2005 09:56:47 -0500 From: "Theodore Ts'o" To: Bill Davidsen Cc: linux-kernel@vger.kernel.org Subject: Re: Sun's ZFS and Linux Message-ID: <20051122145647.GC29179@thunk.org> Mail-Followup-To: Theodore Ts'o , Bill Davidsen , linux-kernel@vger.kernel.org References: <9611fa230511181538g3e8ec403uafa9ed32b560fb0c@mail.gmail.com> <20051119172337.GA24765@thunk.org> <438230B6.8070503@tmr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <438230B6.8070503@tmr.com> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1472 Lines: 29 On Mon, Nov 21, 2005 at 03:40:22PM -0500, Bill Davidsen wrote: > >That wouldn't be a "port", it would have to be a complete > >reimplementation from scratch. And, of course, of further concern > >would be whether or not there are any patents that Sun may have filed > >covering ZFS. If the patents have only been licensed for CDDL > >licensed code, then that won't help a GPL'ed covered reimplementation. > > > What a great chance to try out userfs. Just for yucks, people who are interested in doing might want to first implement ext2 in userspace --- this would be relatively easy, given that most of the code to do this is already in libext2fs, and interface it to userfs. Next, benchmark ext2 in userspace using userfs, and compare it to ext2 running in the kernel using the identical kernel and hardware configuration, and report on the results. Try doing this on both a uniprocessor system as well as a 4-way SMP system, and let us know what you find..... I think I know, but it would be a very interesting experiment, and would probably be a great paper to publish at some conference such as OLS, LCA, LK, etc., especially if were combined with suggestions about how to improve userfs's performance. - Ted - 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/