Date: Mon, 17 Jan 2005 21:10:05 -0800 From: Kris Kennaway <kris@obsecurity.org> To: Kris Kennaway <kris@obsecurity.org>, Miguel Mendez <flynn@energyhq.es.eu.org>, freebsd-questions@freebsd.org Subject: Re: Slow directory access with lots of files Message-ID: <20050118051005.GA34559@xor.obsecurity.org> In-Reply-To: <20050118003210.GA84803@falcon.midgard.homeip.net> References: <41EC0D80.8090403@totem.is-a-geek.com> <20050117191343.GA79136@xor.obsecurity.org> <20050117213425.595e6856.flynn@energyhq.es.eu.org> <20050117224911.GA31567@xor.obsecurity.org> <20050118003210.GA84803@falcon.midgard.homeip.net>
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--9amGYk9869ThD9tj Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jan 18, 2005 at 01:32:10AM +0100, Erik Trulsson wrote: > On Mon, Jan 17, 2005 at 02:49:11PM -0800, Kris Kennaway wrote: > > On Mon, Jan 17, 2005 at 09:34:25PM +0100, Miguel Mendez wrote: > > > On Mon, 17 Jan 2005 11:13:43 -0800 > > > Kris Kennaway <kris@obsecurity.org> wrote: > > >=20 > > > Hi, > > >=20 > > > > Do you have UFS_DIRHASH in your kernel? If you don't, or if you ad= ded > > > > it after the disk was already populated, you'll see the benefits if > > > > you dump, wipe and restore the disk. > > >=20 > > > Could you elaborate on that? My impression has always been that dirha= sh > > > does all its magic in memory, without persistant data stored on disk. > >=20 > > No. It's an optimized method for laying out the data on disk. I > > think you're confusing it with softupdates, but that still doesn't > > work entirely that way. >=20 > No, this time it is you who are confused. UFS_DIRHASH does not affect > the layout on disk at all as far as I can tell. > You are probably confusing it with the dirpref changes that were made > back in 2001 at approximately the same time as UFS_DIRHASH was added. Sorry, you're right! Kris --9amGYk9869ThD9tj Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFB7JotWry0BWjoQKURAr2UAKCbGUXDHNy2euVRA0GZ4E8W1XfaXgCfX+38 gdIT3G0sbw3K87CBHzjzXSg= =gYJY -----END PGP SIGNATURE----- --9amGYk9869ThD9tj--
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