From owner-freebsd-scsi Fri Apr 14 12:47:26 1995 Return-Path: freebsd-scsi-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id MAA02981 for freebsd-scsi-outgoing; Fri, 14 Apr 1995 12:47:26 -0700 Received: from trout.sri.MT.net (trout.sri.MT.net [204.182.243.12]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id MAA02975 for ; Fri, 14 Apr 1995 12:47:22 -0700 Received: (from nate@localhost) by trout.sri.MT.net (8.6.11/8.6.11) id NAA29549; Fri, 14 Apr 1995 13:51:19 -0600 Date: Fri, 14 Apr 1995 13:51:19 -0600 From: Nate Williams Message-Id: <199504141951.NAA29549@trout.sri.MT.net> In-Reply-To: "Rodney W. Grimes" "Re: SCSI target" (Apr 14, 11:42am) X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: "Rodney W. Grimes" Subject: Re: SCSI target Cc: freebsd-scsi@FreeBSD.org Sender: freebsd-scsi-owner@FreeBSD.org Precedence: bulk > Your not going to get much more out of *any* ISA controller. The 1542CF > will do a little better, but basically your problem is the speed of > the ISA bus bus mastering (typical max is 5MB/sec *burst*, sustainted > goes down to about 3.7-4MB/sec). You should be getting about 3MB/sec > out of your 1542B and I have not seen anthing better on ISA. I *should* be seeing 3MB/sec, but I've never got #'s even close. This is with 2.0R install created FS's. IOZONE: Performance Test of Sequential File I/O -- V1.16 (10/28/92) By Bill Norcott Operating System: POSIX 1003.1-1988 -- using fsync() Send comments to: norcott_bill@tandem.com IOZONE writes a 32 Megabyte sequential file consisting of 65536 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 32 Megabyte file, 'iozone.tmp'...31.257812 seconds Reading the file...24.953125 seconds IOZONE performance measurements: 1073473 bytes/second for writing the file 1344698 bytes/second for reading the file Nate