Date: Fri, 14 Apr 1995 13:51:19 -0600 From: Nate Williams <nate@trout.sri.MT.net> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: freebsd-scsi@FreeBSD.org Subject: Re: SCSI target Message-ID: <199504141951.NAA29549@trout.sri.MT.net> In-Reply-To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> "Re: SCSI target" (Apr 14, 11:42am)
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> 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
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