From owner-freebsd-bugs  Fri Jun 22  9:20:10 2001
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP id 0534637B401
	for <freebsd-bugs@hub.freebsd.org>; Fri, 22 Jun 2001 09:20:06 -0700 (PDT)
	(envelope-from gnats@FreeBSD.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.11.3/8.11.3) id f5MGK5J94656;
	Fri, 22 Jun 2001 09:20:05 -0700 (PDT)
	(envelope-from gnats)
Date: Fri, 22 Jun 2001 09:20:05 -0700 (PDT)
Message-Id: <200106221620.f5MGK5J94656@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
Cc: 
From: Peter Pentchev <roam@orbitel.bg>
Subject: Re: misc/28339: Slow Disk performance on 4.3 (about half that on 4.2)
Reply-To: Peter Pentchev <roam@orbitel.bg>
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-bugs.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-bugs>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-bugs>
X-Loop: FreeBSD.org

The following reply was made to PR misc/28339; it has been noted by GNATS.

From: Peter Pentchev <roam@orbitel.bg>
To: Matthew Williams <matthew@informatics.bangor.ac.uk>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: misc/28339: Slow Disk performance on 4.3 (about half that on 4.2)
Date: Fri, 22 Jun 2001 19:08:50 +0300

 On Fri, Jun 22, 2001 at 08:38:12AM -0700, Matthew Williams wrote:
 > 
 > >Number:         28339
 > >Category:       misc
 > >Synopsis:       Slow Disk performance on 4.3 (about half that on 4.2)
 > >Originator:     Matthew Williams
 > >Release:        4.3
 > >Organization:
 > University of Wales, Bangor. UK.
 > >Environment:
 > FreeBSD HOSTNAME.sees.bangor.ac.uk 4.3-REALEASE FreeBSD 4.3-RELEASE #2:
 > Thu Jun 21 14:45:51 BST  root@HOSTNAME.sees.bangor.ac.uk:/usr/src/sys/compile/P500
 >  i386
 > >Description:
 > We use dd to install Windows onto a partition. Under 4.3 the performance has reduced dramatically.
 > I have experimented with a binary only install in 4.2 and 4.3 creating a file from
 > /dev/zero and dd-ing it on to a unmounted raw partition.
 > Under 4.2 I get an average throughput of about 6MB/sec but under 4.3 this
 > drops to 3.5MB/sec.
 
 4.3 has IDE write caching off by default.  To enable it, add this line:
 
 hw.ata.wc="1"
 
 to the /boot/loader.conf file, and reboot.
 
 G'luck,
 Peter
 
 -- 
 "yields falsehood, when appended to its quotation." yields falsehood, when appended to its quotation.

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