From owner-freebsd-scsi Sun Mar 14 6:16:42 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from frmug.org (frmug-gw.frmug.org [193.56.58.252]) by hub.freebsd.org (Postfix) with ESMTP id 65691154D0; Sun, 14 Mar 1999 06:16:32 -0800 (PST) (envelope-from roberto@keltia.freenix.fr) Received: (from uucp@localhost) by frmug.org (8.9.1/frmug-2.3/nospam) with UUCP id PAA28294; Sun, 14 Mar 1999 15:16:14 +0100 (CET) (envelope-from roberto@keltia.freenix.fr) Received: by keltia.freenix.fr (Postfix, from userid 101) id 6728B87B6; Sun, 14 Mar 1999 13:35:28 +0100 (CET) Date: Sun, 14 Mar 1999 13:35:28 +0100 From: Ollivier Robert To: Kenneth Merry Cc: "FreeBSD SCSI Users' list" Subject: Re: cvs commit: src/sys/cam cam_xpt.c Message-ID: <19990314133528.A4071@keltia.freenix.fr> Mail-Followup-To: Kenneth Merry , FreeBSD SCSI Users' list References: <199903140515.VAA29957@freefall.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii User-Agent: Mutt/0.95.3i In-Reply-To: <199903140515.VAA29957@freefall.freebsd.org>; from Kenneth Merry on Sat, Mar 13, 1999 at 09:15:39PM -0800 X-Operating-System: FreeBSD 4.0-CURRENT/ELF ctm#5130 AMD-K6 MMX @ 200 MHz Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org According to Kenneth Merry: > Log: > Disable tagged queueing for the IBM DCAS drives. These drives have poor > write performance when tagged queueing is enabled. Do you call that poor performance ? I have two 4 gig drives and they don't seem that slow for me... Seeker 1...Seeker 3...Seeker 2...start 'em...done...done...done... -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU dcas4 256 2891 37.3 2534 9.8 1797 7.9 5913 48.2 5916 19.2 96.0 3.5 Writing the 256 Megabyte file, 'iozone.tmp'...95.656250 seconds Reading the file...43.687500 seconds IOZONE performance measurements: 2806251 bytes/second for writing the file 6144445 bytes/second for reading the file ncr0: rev 0x03 int a irq 9 on pci0.11.0 da1 at ncr0 bus 0 target 1 lun 0 da1: Fixed Direct Access SCSI-2 device da1: 40.00MB/s transfers (20.00MHz, offset 15, 16bit), Tagged Queueing Enabled da1: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C) da0 at ncr0 bus 0 target 0 lun 0 da0: Fixed Direct Access SCSI-2 device da0: 40.00MB/s transfers (20.00MHz, offset 15, 16bit), Tagged Queueing Enabled da0: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C) -- Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr FreeBSD keltia.freenix.fr 4.0-CURRENT #70: Sat Feb 27 09:43:08 CET 1999 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message