From owner-freebsd-questions@FreeBSD.ORG  Mon Jan 17 22:49:12 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
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 A674516A4CF
	for <freebsd-questions@freebsd.org>;
	Mon, 17 Jan 2005 22:49:12 +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 4F47743D6B
	for <freebsd-questions@freebsd.org>;
	Mon, 17 Jan 2005 22:49:12 +0000 (GMT)
	(envelope-from kris@obsecurity.org)
Received: by obsecurity.dyndns.org (Postfix, from userid 1000)
	id 6717951506; Mon, 17 Jan 2005 14:49:11 -0800 (PST)
Date: Mon, 17 Jan 2005 14:49:11 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: Miguel Mendez <flynn@energyhq.es.eu.org>
Message-ID: <20050117224911.GA31567@xor.obsecurity.org>
References: <41EC0D80.8090403@totem.is-a-geek.com>
	<20050117191343.GA79136@xor.obsecurity.org>
	<20050117213425.595e6856.flynn@energyhq.es.eu.org>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="mYCpIKhGyMATD0i+"
Content-Disposition: inline
In-Reply-To: <20050117213425.595e6856.flynn@energyhq.es.eu.org>
User-Agent: Mutt/1.4.2.1i
cc: freebsd-questions@freebsd.org
cc: Kris Kennaway <kris@obsecurity.org>
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 <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Jan 2005 22:49:12 -0000


--mYCpIKhGyMATD0i+
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

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 added
> > 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 dirhash
> does all its magic in memory, without persistant data stored on disk.

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.

Kris
--mYCpIKhGyMATD0i+
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (FreeBSD)

iD8DBQFB7EDnWry0BWjoQKURAtFYAKDjoU8mLDU716kzcVAYUR9BLRjUdwCgvuO4
Sx/49Fgd4mn/fCf2VfQLmOA=
=tN3o
-----END PGP SIGNATURE-----

--mYCpIKhGyMATD0i+--