From owner-freebsd-questions  Wed Apr 21 13:13: 2 1999
Delivered-To: freebsd-questions@freebsd.org
Received: from misha.cisco.com (misha.cisco.com [171.69.206.50])
	by hub.freebsd.org (Postfix) with ESMTP id AB9EF15907
	for <questions@freebsd.org>; Wed, 21 Apr 1999 13:10:46 -0700 (PDT)
	(envelope-from mi@misha.cisco.com)
Received: (from mi@localhost)
	by misha.cisco.com (8.9.2/8.9.1) id QAA57336
	for questions@freebsd.org; Wed, 21 Apr 1999 16:08:17 -0400 (EDT)
	(envelope-from mi)
From: Mikhail Teterin <mi@misha.cisco.com>
Message-Id: <199904212008.QAA57336@misha.cisco.com>
Subject: writing slower with SoftUpdates
To: questions@freebsd.org
Date: Wed, 21 Apr 1999 16:08:17 -0400 (EDT)
Reply-To: mi@aldan.algebra.com
X-Mailer: ELM [version 2.4ME+ PL52 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

According to iozone, writing a 256M file to this empty 512M
fs works at

	18247338 bytes/second without SoftUpdates
	16687585 bytes/second with SoftUpdates

The results are repeatable with very little deviations. Reading speed
is about the same regardless of SoftUpdates and is around 13.9Mb/s.

The disk is a 9Gb Cheetah LVD, attached to the LVD outlet of Adaptec's
2940U2W.

Another, identical Cheetah on the same SCSI cable, with another 512M
empty filesystem gives

	18179755 b/s with SoftUpdates
	18315425 b/s without SoftUpdates

Again, reading is not affected, but averages higher at around 18Mb/s.

Are this results what one should expect?

	-mi


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message