From owner-freebsd-questions@FreeBSD.ORG Tue Jan 18 05:10:07 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0100016A4CE for ; Tue, 18 Jan 2005 05:10:07 +0000 (GMT) Received: from obsecurity.dyndns.org (CPE0050040655c8-CM00111ae02aac.cpe.net.cable.rogers.com [69.199.47.57]) by mx1.FreeBSD.org (Postfix) with ESMTP id A227543D2D for ; Tue, 18 Jan 2005 05:10:06 +0000 (GMT) (envelope-from kris@obsecurity.org) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 2D20C51439; Mon, 17 Jan 2005 21:10:06 -0800 (PST) Date: Mon, 17 Jan 2005 21:10:05 -0800 From: Kris Kennaway To: Kris Kennaway , Miguel Mendez , freebsd-questions@freebsd.org Message-ID: <20050118051005.GA34559@xor.obsecurity.org> 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> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9amGYk9869ThD9tj" Content-Disposition: inline In-Reply-To: <20050118003210.GA84803@falcon.midgard.homeip.net> User-Agent: Mutt/1.4.2.1i Subject: Re: Slow directory access with lots of files X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jan 2005 05:10:07 -0000 --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 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--