Date: Tue, 20 Jun 2006 19:33:39 +0200 From: Ulrich Spoerlein <uspoerlein@gmail.com> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Journaling UFS with gjournal. Message-ID: <20060620173339.GA1638@roadrunner.informatik.uni-wuerzburg.de> In-Reply-To: <20060619131101.GD1130@garage.freebsd.pl> References: <20060619131101.GD1130@garage.freebsd.pl>
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--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--
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