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