From owner-freebsd-current@FreeBSD.ORG Tue Jun 20 20:50:50 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1437C16A49E for ; Tue, 20 Jun 2006 20:50:50 +0000 (UTC) (envelope-from uspoerlein@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.184]) by mx1.FreeBSD.org (Postfix) with ESMTP id 24A0B43D6E for ; Tue, 20 Jun 2006 20:50:30 +0000 (GMT) (envelope-from uspoerlein@gmail.com) Received: by nf-out-0910.google.com with SMTP id h2so1248nfe for ; Tue, 20 Jun 2006 13:50:30 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:date:from:to:cc:subject:message-id:mail-followup-to:references:mime-version:content-type:content-disposition:in-reply-to; b=V+SfkU1yMDE8CPKJ5Y7Ojk8uWGueDBuZgYFi754VxAJ6rinWPIH98lNLhimlu0XAuaTVNgQ7VSJVlM86l0R84Wo1jsiALZlFW+QOn49VG5kQSOVxvVPTY6j0JkBGd6yu9HO5nu0zGLcqNx9/7+nDaLrJRbk+Rs/2Q5q/Wo/VEv0= Received: by 10.49.60.12 with SMTP id n12mr6009379nfk; Tue, 20 Jun 2006 13:43:54 -0700 (PDT) Received: from roadrunner.q.local ( [217.185.119.244]) by mx.gmail.com with ESMTP id a24sm7139686nfc.2006.06.20.13.43.52; Tue, 20 Jun 2006 13:43:53 -0700 (PDT) Received: from roadrunner.q.local (localhost [127.0.0.1]) by roadrunner.q.local (8.13.6/8.13.6) with ESMTP id k5KKi37R003488; Tue, 20 Jun 2006 22:44:04 +0200 (CEST) (envelope-from uspoerlein@gmail.com) Received: (from q@localhost) by roadrunner.q.local (8.13.6/8.13.6/Submit) id k5KHXdv3002364; Tue, 20 Jun 2006 19:33:39 +0200 (CEST) (envelope-from uspoerlein@gmail.com) Date: Tue, 20 Jun 2006 19:33:39 +0200 From: Ulrich Spoerlein To: Pawel Jakub Dawidek Message-ID: <20060620173339.GA1638@roadrunner.informatik.uni-wuerzburg.de> Mail-Followup-To: Pawel Jakub Dawidek , freebsd-current@FreeBSD.org, freebsd-fs@FreeBSD.org, freebsd-geom@FreeBSD.org References: <20060619131101.GD1130@garage.freebsd.pl> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="wRRV7LY7NUeQGEoC" Content-Disposition: inline In-Reply-To: <20060619131101.GD1130@garage.freebsd.pl> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Journaling UFS with gjournal. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Jun 2006 20:50:50 -0000 --wRRV7LY7NUeQGEoC Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Pawel Jakub Dawidek wrote: > Hello. >=20 > For the last few months I have been working on gjournal project. Cool Stuff! > Reading. grep -r on two src/ directories in parallel: > UFS: 84s > UFS+SU: 138s > gjournal(1): 102s > gjournal(2): 89s >=20 > As you can see, even on one disk, untaring eight src.tgz is two times > faster than UFS+SU. I've no idea why gjournal is faster in reading. The UFS+SU score doesn't seem right. Why do SU have a negative impact on read performance? Is it solely because of the atime updates? Ulrich Spoerlein --=20 PGP Key ID: 20FEE9DD Encrypted mail welcome! Fingerprint: AEC9 AF5E 01AC 4EE1 8F70 6CBD E76E 2227 20FE E9DD Which is worse: ignorance or apathy? Don't know. Don't care. --wRRV7LY7NUeQGEoC Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEmDFy524iJyD+6d0RAgcyAJoDlV8lNXEyU0AdGTc9XJtCSpYbLACfYEI3 yjo78oywHF0CfLTt9aq5IzI= =0lpD -----END PGP SIGNATURE----- --wRRV7LY7NUeQGEoC--