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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mira.net.au!news.netspace.net.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.cis.okstate.edu!nntp.ksu.edu!newsfeeder.gi.net!mr.net!news.radio.cz!CESspool!news.maxwell.syr.edu!feed1.news.erols.com!howland.erols.net!newsxfer.itd.umich.edu!newsxfer3.itd.umich.edu!news1.best.com!nntp1.ba.best.com!not-for-mail From: dillon@flea.best.net (Matt Dillon) Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.bsdi.misc,comp.sys.sgi.misc Subject: Re: no such thing as a "general user community" Date: 21 Mar 1997 13:08:19 -0800 Organization: BEST Internet Communications, Inc. Lines: 26 Message-ID: <5gutc3$l4@flea.best.net> References: <331BB7DD.28EC@net5.net> <5goqrq$5ak$1@news.clinet.fi> <5gpcf9$767@flea.best.net> <3331C5DF.7284@cet.co.jp> NNTP-Posting-Host: flea.best.net Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:37562 comp.unix.bsd.bsdi.misc:6436 comp.sys.sgi.misc:29371 :In article <3331C5DF.7284@cet.co.jp>, H. Asatani <bjc@cet.co.jp> wrote: :>Matt Dillon wrote: :>> :>> XFs's claim to fame is: :>> :>> * hashed directory lookups, making namei() on large directories more :>> efficient (but only on large directories). :> :>Are you talking about an on disk structure. FBSD has a simple sequential on disk :>directory structure. There is a hashed name cache so assuming locality of :>reference... Yes, of course I am talking about the on-disk structure. Nobody builds an O(N) cache for this sort of stuff. The on-disk structure is extremely important under load, when the namei() cache hit ratio falls below 90%. :>Is this a log (journaling) system? :> :>FBSD has something called LFS but it is completely different. It's a log :>structured file system written by Margo Seltzer now at Harvard. In a log :>structured fs the files are the logs themselves. It optimises write performance :>over reads, heavily assuming LOR. They showed studies where the amount of actual Good question. I don't know how XFS is classed. -Matt