From owner-freebsd-afs@FreeBSD.ORG Mon Feb 4 16:12:18 2008 Return-Path: Delivered-To: freebsd-afs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9ECDA16A421; Mon, 4 Feb 2008 16:12:18 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (gizmo.acns.msu.edu [35.8.1.43]) by mx1.freebsd.org (Postfix) with ESMTP id 3E08E13C45B; Mon, 4 Feb 2008 16:12:18 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (localhost [127.0.0.1]) by gizmo.acns.msu.edu (8.13.6/8.13.6) with ESMTP id m14FwiQg007718; Mon, 4 Feb 2008 10:58:44 -0500 (EST) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: (from jerrymc@localhost) by gizmo.acns.msu.edu (8.13.6/8.13.6/Submit) id m14Fwh3o007717; Mon, 4 Feb 2008 10:58:43 -0500 (EST) (envelope-from jerrymc) Date: Mon, 4 Feb 2008 10:58:43 -0500 From: Jerry McAllister To: Kyle Moffett Message-ID: <20080204155842.GA7685@gizmo.acns.msu.edu> References: <18CC5A4A2AC36D7FF57615EE@ganymede.hub.org> <478AF6BC.8050604@highperformance.net> <20080114142124.Y55696@fledge.watson.org> <876FB8E38251C27B14CCCA29@atlantis.pc.cs.cmu.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i X-Mailman-Approved-At: Mon, 04 Feb 2008 17:11:23 +0000 Cc: rra@stanford.edu, rees@umich.edu, freebsd-fs@freebsd.org, Robert Watson , matt@linuxbox.com, freebsd-afs@freebsd.org, "Jason C. Wells" , port-freebsd@openafs.org, openafs-devel@openafs.org, freebsd-questions@freebsd.org, Jeffrey Hutzelman Subject: Re: [OpenAFS-devel] Re: AFS ... or equivalent ... X-BeenThere: freebsd-afs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: The Andrew File System and FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Feb 2008 16:12:18 -0000 On Mon, Feb 04, 2008 at 12:58:29AM -0500, Kyle Moffett wrote: > On Jan 16, 2008 1:48 PM, Jeffrey Hutzelman wrote: > > The "let's just slurp everything into the main distribution so we don't > > have to worry about stable interfaces" approach is really poor. It > > encourages bad engineering practice among people maintaining the main > > distribution, discourages innovation and extension by others, and generally > > doesn't scale. It's far better to either attempt to maintain stable > > external interfaces to the VFS and VM subsystems, or else admit that you > > don't have the resources to do so given the relatively small number of > > external users, in which case you almost certainly also don't have the > > resources to keep on top of updates to something like OpenAFS. > > The Linux Kernel presents a very strong counter-argument-by-example. > The amount of patches merged per released version has been linearly > increasing over the last several years; the 2.6.23 => 2.6.24 patch was > 49MB uncompressed, with a 5.7MB changelog. Of that, a significant > portion were VFS changes which touched most filesystems. The various > filesystem-related changes alone between 2.6.23 and 2.6.24 were > 2.9MB. So, there are reasons why many of us prefer FreeBSD to Linux. ////jerry ........ For reference, the *entire* OpenAFS diff between 2.4.6 and > 2.5.30 is all of 8.2MB. The Linux Kernel changes include partial > support for having per-process views of a single filesystem > (Specifically /proc, so /proc/net can have differing contents between > network namespaces). Other features which Linux supports that > virtually no other OS does is multiple filesystem namespaces, where > the mount-tree is selectively independent or shared between > namespaces. >