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From: dillon@flea.best.net (Matt Dillon)
Newsgroups: comp.unix.bsd.freebsd.misc,comp.sys.sgi.misc
Subject: Re: no such thing as a "general user community"
Date: 20 Mar 1997 11:06:37 -0800
Organization: BEST Internet Communications, Inc.
Lines: 41
Message-ID: <5gs1rt$kel@flea.best.net>
References: <331BB7DD.28EC@net5.net> <5gmb58$6jd$1@news.clinet.fi> <5gn3ig$83d@flea.best.net> <333033B4.46AA@cet.co.jp>
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:37384 comp.sys.sgi.misc:29284
:In article <333033B4.46AA@cet.co.jp>,
:Michael Hancock <michaelh@cet.co.jp> wrote:
:>Matt Dillon wrote:
:>
:> As far as sensible SMP or filesystems 'like XFS' go. I would
:> like to point
:> out that XFS has only very recently become stable, and only
:> very, VERY
:> recently has gotten a filesystem quota capability. XFS's only
:> performance
:> advantage is in directory lookups. It does not have any other
:> advantage
:> over FFS. Filesystem locks and lockout conditions in XFS are
:> barely
:> on-par with the locking used in FFS in FreeBSD kernels (whereas
:> in EFS the
:> locks were substandard). Furthermore, SGI treats RAID functions
:> as
:> extra-cost items, requiring a licence, rather then as native
:> items. And
:> they aren't even that good.
:>
:>There was a suggestion to do name canonization on FBSD because it did a
:>lot of string copying of the path thru the VOP layers. Namei/ufs_lookup
:>are pretty hairy, it might be worth it to redo these.
:>
:>Do you know how XFS does things?
:>
:>Regards,
:>
:>Mike Hancock
Not having access to the xfs source, I can't say beyond what SGI tells
me.
As far as namei() string copies go... namei() has never really caused
a cpu hogging issue. The issue with namei() has always been with its
caching.
-Matt