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Date:      Thu, 22 Jun 2006 11:45:52 +0200
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        freebsd-current@FreeBSD.org, freebsd-fs@FreeBSD.org, freebsd-geom@FreeBSD.org
Subject:   Re: Journaling UFS with gjournal.
Message-ID:  <20060622094552.GC30568@garage.freebsd.pl>
In-Reply-To: <20060620173339.GA1638@roadrunner.informatik.uni-wuerzburg.de>
References:  <20060619131101.GD1130@garage.freebsd.pl> <20060620173339.GA1638@roadrunner.informatik.uni-wuerzburg.de>

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On Tue, Jun 20, 2006 at 07:33:39PM +0200, Ulrich Spoerlein wrote:
+> Pawel Jakub Dawidek wrote:
+> > 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.
+>=20
+> 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?

As I said, I've not idea. You may simply ignore my benchmarks and try
them on your own:)

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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