From owner-freebsd-hardware  Sat Apr 18 01:09:49 1998
Return-Path: <owner-freebsd-hardware@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id BAA21775
          for freebsd-hardware-outgoing; Sat, 18 Apr 1998 01:09:49 -0700 (PDT)
          (envelope-from owner-freebsd-hardware@FreeBSD.ORG)
Received: from sos.freebsd.dk (sos.freebsd.dk [195.8.129.33])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id IAA21766;
          Sat, 18 Apr 1998 08:09:45 GMT
          (envelope-from sos@sos.freebsd.dk)
Received: (from sos@localhost)
	by sos.freebsd.dk (8.8.8/8.8.8) id KAA08148;
	Sat, 18 Apr 1998 10:09:36 +0200 (MEST)
	(envelope-from sos)
Message-Id: <199804180809.KAA08148@sos.freebsd.dk>
Subject: Re: best wdc0 flags ?
In-Reply-To: <19980418023307.34709@vmunix.com> from Mark Mayo at "Apr 18, 98 02:33:07 am"
To: mark@vmunix.com (Mark Mayo)
Date: Sat, 18 Apr 1998 10:09:36 +0200 (MEST)
Cc: stable@FreeBSD.ORG, hardware@FreeBSD.ORG
From: Søren Schmidt <sos@FreeBSD.ORG>
Reply-to: sos@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL30 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Sender: owner-freebsd-hardware@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

In reply to Mark Mayo who wrote:
> Hi. I just put a shiney new IDE (Ultra33) drive in a machine, and
> I'm wondering what the best flags to use for the drive are.. I realize
> that I can't get DMA on -STABLE (cvsupping right now), but with the
> default LINT flags of:
> 
> controller	wdc0	at isa? port "IO_WD1" bio irq 14 flags 0x00ff8004 ..
> which turns on 32-bit transfers and multi-block-4
> 
> I'm gettting really crappy performance.. 
> 
> vnode:{76}~ % iozone 160 32000
> ...
> IOZONE performance measurements:
> 	2237052 bytes/second for writing the file
> 	2264181 bytes/second for reading the file
> 
> Now that is horrible. :-) Same results with block-size of 8K. 
> I think I'll try without the flag option at all and see how it performs.

Hmm, you should see about 9M/s from a drive like this..
I havn't run 2.2.x for ages but I've made two NFS servers with 4 of those
exact disks using -current, and it gets ~9M/s, so the facts are there...

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt               (sos@FreeBSD.org)               FreeBSD Core Team
                Even more code to hack -- will it ever end
..

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