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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.