Problems with FFS and directories of over 1000 entries....
I understand that FFS has some performance problems in directory/file structures that have over 1000 entires... though I'm not sure this applies to FFS under FreeBSD-5.x. Can someone comment on this? Forrest ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Problems with FFS and directories of over 1000 entries....
On Thu, Mar 04, 2004 at 02:42:54PM -0500, Forrest Aldrich wrote: I understand that FFS has some performance problems in directory/file structures that have over 1000 entires... though I'm not sure this applies to FFS under FreeBSD-5.x. Can someone comment on this? No -- you understand incorrectly. Large directories have not been a problem since UFS_DIRHASH went into the tree, which was, oh, two and a half years ago: http://docs.freebsd.org/cgi/getmsg.cgi?fetch=18975+0+archive/2001/freebsd-fs/20010624.freebsd-fs Not that UFS did badly before that: 1000 entries in one directory probably wouldn't have been problematic. 10,000 could have been a different matter. 100,000 would have been difficult to deal with. UFS_DIRHASH is enabled in the GENERIC kernel, and has been since 2001: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/conf/GENERIC.diff?r1=1.246.2.36r2=1.246.2.37only_with_tag=RELENG_4 Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks Savill Way PGP: http://www.infracaninophile.co.uk/pgpkey Marlow Tel: +44 1628 476614 Bucks., SL7 1TH UK pgp0.pgp Description: PGP signature
Re: Problems with FFS and directories of over 1000 entries....
In the last episode (Mar 04), Forrest Aldrich said: I understand that FFS has some performance problems in directory/file structures that have over 1000 entires... though I'm not sure this applies to FFS under FreeBSD-5.x. Can someone comment on this? I see no issues on my systems, either 4.x or 5.x, with up to 10k files in a directory. Enabling the UFS_DIRHASH kernel option (available in 4.4 and later) will greatly speed up access to large directories, at the cost of a little memory (adjustable via sysctl). -- Dan Nelson [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
