Annotation of www/softupdate.html, Revision 1.3
1.1 deraadt 1: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN">
2: <html>
3: <head>
4: <title>Soft Updates</title>
5: <link rev=made href=mailto:www@openbsd.org>
6: <meta name="resource-type" content="document">
7: <meta name="copyright" content="This document copyright 1997 by OpenBSD.">
8: </head>
9:
10: <BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#23238E">
11:
1.2 pauls 12: <img alt="[OpenBSD]" height=30 width=141 SRC="images/smalltitle.gif">
1.1 deraadt 13: <p>
14:
15: <h2><font color=#0000e0>Soft Updates</font></h2>
16:
17: Over the last two years Kirk McKusick has been working on something
18: called "soft updates". This is based on an idea proposed by Greg
19: Ganger and Yale Patt that imposing a partial ordering on the buffer
1.3 ! espie 20: cache operations would permit the requirement for synchronous writing
1.1 deraadt 21: of directory entries to be removed from the FFS code. Thus, a large
22: performance increase of disk writing performance.
23: <p>
24:
25: <strong>NOTE: This code only works in OpenBSD -current. It does NOT
26: work in OpenBSD 2.2! Don't even waste your time downloading it if you
27: are not running OpenBSD -current.</strong>
28: <p>
29:
30: The source code for doing this is not yet free. You should read the
31: copyright notices on the files carefully.
32: Current versions of the files are
33: <a href=http://pdos.lcs.mit.edu/~csapuntz/softdep.tar.gz>available</a>.
34: Note that using this archive (which is updated often) with a system more
35: than 3 days old might cause you serious grief. You've been warned.
36: <p>
37:
38: Please direct all problem reports with as MUCH information as possible
39: (kernel coredumps, tracebacks, etc) to
40: <a href=mailto:csapuntz@openbsd.org>Costa</a>.
41: Do not waste his time with any other questions or incomplete problem
42: reports.