Date: Wed, 4 Feb 1998 09:31:55 +0100 (MET) From: Dirk-Willem van Gulik <dirk.vangulik@jrc.it> To: Julian Elischer <julian@whistle.com> Cc: hackers@FreeBSD.ORG Subject: Re: kirk's soft-update integration.. Message-ID: <Pine.SOL.3.96.980204093132.3690A-100000@elect6.jrc.it> In-Reply-To: <34D7D0B0.500F9F30@whistle.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Of course, it would be to simple to just ask Kirk nicely for a lincence for FreeBSD :-) Dw. On Tue, 3 Feb 1998, Julian Elischer wrote: > Kirk's soft update code has a poison pill license for > commercial use, (he gives the license on a case by case basis) but > it greatly speeds up FS access, and is freely usable for private > use. The patches, when added to FreeBSD actually do yield a slight > improvement even when used with the dummy stub module that can be > used to make the system still work for commercial uses. > The slight improvement is due to his replacement syncer. > > While the copyrighted file cannot be used in every situation, the > system as modified to use it seems to not have any bad side effects, > and as the file itself can be distributed freely with a source > available OS, there would be no problem with even distributing > the files to allow private users to make use of this. > > The effect is to make the speed of a filesystem approach that of > an async FS while maintaining the safety of a sync FS. > (It may even be faster than our async FS). > > What I want to get from the readership here, and more importantly, > CORE members, is whether the changes for this should be integrated > back into FreeBSD-current, and when. > > I'm not SURE yet whether I CAN put the changes back (OpenBSD did) > but I'd like some sort of a reading of the acceptance of it.. > > An indication of how useful this is is: > > multiple compiles, copies, rms etc. > > With soft updates: writes: 6 sync, 1,113,686 async; run time 19hr, 50min > Normal filesystem: writes: 1,459,147 sync, 487,031 async; run time 27hr, > 15min > > The upshot is 42% less I/O and 28% shorter running time. > ---------------------------- > > the license is: > > /* > * Copyright 1997 Marshall Kirk McKusick. All Rights Reserved. > * > * The soft updates code is derived from the appendix of a University > * of Michigan technical report (Gregory R. Ganger and Yale N. Patt, > * "Soft Updates: A Solution to the Metadata Update Problem in File > * Systems", CSE-TR-254-95, August 1995). > * > * The following are the copyrights and redistribution conditions that > * apply to this copy of the soft update software. For a license > * to use, redistribute or sell the soft update software under > * conditions other than those described here, please contact the > * author at one of the following addresses: > * > * Marshall Kirk McKusick mckusick@mckusick.com > * 1614 Oxford Street +1-510-843-9542 > * Berkeley, CA 94709-1608 > * USA > * > * Redistribution and use in source and binary forms, with or without > * modification, are permitted provided that the following conditions > * are met: > * > * 1. Redistributions of source code must retain the above copyright > * notice, this list of conditions and the following disclaimer. > * 2. Redistributions in binary form must reproduce the above copyright > * notice, this list of conditions and the following disclaimer in > the > * documentation and/or other materials provided with the > distribution. > * 3. None of the names of McKusick, Ganger, Patt, or the University of > * Michigan may be used to endorse or promote products derived from > * this software without specific prior written permission. > * 4. Redistributions in any form must be accompanied by information on > * how to obtain complete source code for any accompanying software > * that uses the this software. This source code must either be > included > * in the distribution or be available for no more than the cost of > * distribution plus a nominal fee, and must be freely > redistributable > * under reasonable conditions. For an executable file, complete > * source code means the source code for all modules it contains. > * It does not mean source code for modules or files that typically > * accompany the operating system on which the executable file runs, > * e.g., standard library modules or system header files. > * > * THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY > * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE > IMPLIED > * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE > ARE > * DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR > * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR > CONSEQUENTIAL > * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE > GOODS > * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) > * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, > STRICT > * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY > WAY > * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY > OF > * SUCH DAMAGE. > * > * @(#)ffs_softdep.c 9.12 (McKusick) 12/2/97 > */ >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.SOL.3.96.980204093132.3690A-100000>