From owner-freebsd-current Tue Nov 24 01:34:01 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id BAA28502 for freebsd-current-outgoing; Tue, 24 Nov 1998 01:34:01 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from zappa.demon.nl (zappa.demon.nl [195.173.232.30]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id BAA28476 for ; Tue, 24 Nov 1998 01:33:58 -0800 (PST) (envelope-from root@zappa.demon.nl) Received: (from root@localhost) by zappa.demon.nl (8.9.1/8.8.8) id KAA01061 for freebsd-current@FreeBSD.ORG; Tue, 24 Nov 1998 10:35:32 +0100 (CET) (envelope-from root) Message-ID: <19981124103532.B613@zappa.demon.nl> Date: Tue, 24 Nov 1998 10:35:32 +0100 From: Ron Klinkien To: freebsd-current@FreeBSD.ORG Subject: Re: Adaptec SCSI messages References: <19981114144915.A244@zappa.demon.nl> <19981117112118.A252@zappa.demon.nl> <19981124011512.B11237@keltia.freenix.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: <19981124011512.B11237@keltia.freenix.fr>; from Ollivier Robert on Tue, Nov 24, 1998 at 01:15:12AM +0100 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Nov 24, 1998 at 01:15:12AM +0100, Ollivier Robert wrote: > According to Ron Klinkien: > > Strange though that after doubling the data transfer rate from 40 -> 80Mb/s > > iozone 100 doesn't reports any increase of speed. > > Because you have enlarged the _bus_ by two doesn't mean the drive is able > to move bytes faster from the platters. > > You are now able to put more disks before saturating the SCSI bus but bear > in mind that it is very unlikely that you'll be ever eble to saturate a 80 > MB/s bus with only one drive. > -- > Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr > FreeBSD keltia.freenix.fr 3.0-CURRENT #2: Sun Nov 8 01:22:20 CET 1998 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message -- I guess you are right, but i wonder why they have invented Ultra 2 disks then. Since my disk performed in Single Ended mode exactly the same as in ULTRA2-LVD mode. --- cut --- zappa# iozone 100 IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) By Bill Norcott Operating System: FreeBSD 2.x -- using fsync() Send comments to: b_norcott@xway.com IOZONE writes a 100 Megabyte sequential file consisting of 204800 records which are each 512 bytes in length. It then reads the file. It prints the bytes-per-second rate at which the computer can read and write files. Writing the 100 Megabyte file, 'iozone.tmp'...9.742188 seconds Reading the file...9.062500 seconds IOZONE performance measurements: 10763250 bytes/second for writing the file 11570493 bytes/second for reading the file zappa# --- cut --- I was hoping it did better than this. Hmm and strange it reports FreeBSD 2.x Ron. --- "You could jam in Joe's garage..." -FZ Ron Klinkien System Engineer ron@zappa.demon.nl http://www.zappa.demon.nl To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message