Date: Fri, 14 Dec 2001 13:12:52 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Carl Schmidt <carl@slackerbsd.org> Cc: Hiten Pandya <hitmaster2k@yahoo.com>, chat@FreeBSD.org Subject: Re: IBM suing (was: RMS Suing was [SUGGESTION] - JFS for FreeBSD) Message-ID: <3C1A6B54.6889BEDD@mindspring.com> References: <4.3.2.7.2.20011214123703.02ad7290@localhost> <20011214195844.56774.qmail@web21110.mail.yahoo.com> <20011214201735.GB14820@Carbon.SlackerBSD.ORG>
next in thread | previous in thread | raw e-mail | index | archive | help
carl@slackerbsd.org wrote: > Softupdates does not need journaling, that would be somewhat redundant. > As far as performance goes have you actually used softupdates compared to > async mounted or even sync mounted ffs partitions? The technology really is complementary. > What other major features are you referring to? JFS has btree based directory structures (actually, Trie's, if you want to get technical about sparse directories after a while), which makes it very fast on the silly "create a billion files" micro benchmarks that people run to "prove" ReiserFS is better, any time someone mentions that it infringes two USL patents on DOW (Delayed Ordered Writes). On the miss case, it means that if you do things like very deep mail queue directories, etc., with sendmail (the documentation specifically discourages doing this, and shows you how to use a hashed directory structure instead), rather than traversing the entire directory, you can traverse log2(N)+1 bifurcation entries instead. On the minus side, it makes the negative caching in the directory name lookup cache much, much less valuable, in general. 8^). [ ... ] Actually, an HSM system would be much more useful for installations needing to deal with huge amounts of data, but borrowing a $120,000 tape robot to hook up to your PC is probably not going to happen... -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3C1A6B54.6889BEDD>