From owner-freebsd-current  Sun Aug 10 00:59:06 1997
Return-Path: <owner-freebsd-current>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id AAA08874
          for current-outgoing; Sun, 10 Aug 1997 00:59:06 -0700 (PDT)
Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id AAA08869
          for <freebsd-current@FreeBSD.ORG>; Sun, 10 Aug 1997 00:59:03 -0700 (PDT)
Received: (from root@localhost)
	by dyson.iquest.net (8.8.6/8.8.5) id CAA01850;
	Sun, 10 Aug 1997 02:58:47 -0500 (EST)
From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199708100758.CAA01850@dyson.iquest.net>
Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it)
In-Reply-To: <199708100714.AAA04251@MindBender.serv.net> from "Michael L. VanLoon -- HeadCandy.com" at "Aug 10, 97 00:14:29 am"
To: michaelv@MindBender.serv.net (Michael L. VanLoon -- HeadCandy.com)
Date: Sun, 10 Aug 1997 02:58:47 -0500 (EST)
Cc: plm@xs4all.nl, freebsd-current@FreeBSD.ORG
Reply-To: dyson@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL31 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-current@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> l count=1600 bs=64k&
> >i.e. start two of them at the same time.
> >I get as result:
> >104857600 bytes transferred in 41.430049 secs (2530955 bytes/sec)
> >104857600 bytes transferred in 41.437855 secs (2530478 bytes/sec)
> 
> What would be much more interesting to me is if you would do this on a
> four-drive ccd stripe-set, both with Ultra-Wide SCSI and "UltraIDE".
> It would be interesting to have a process running non-stop, measuring
> the amount of left-over CPU, at the same time.
> 
That *would* be interesting.  Here are the results for running 2 and 3
concurrent tests -- my GUESS it is likely that the drive is fairly slow
because of the small (read ahead) cache on it -- this is on the same
drive:

1600+0 records in
1600+0 records out
104857600 bytes transferred in 68.005133 secs (1541907 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 68.032161 secs (1541295 bytes/sec)

1600+0 records in
1600+0 records out
104857600 bytes transferred in 90.446126 secs (1159338 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 96.159300 secs (1090457 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 96.263071 secs (1089282 bytes/sec)

John