From owner-freebsd-hardware Thu Aug 22 05:51:21 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id FAA11435 for hardware-outgoing; Thu, 22 Aug 1996 05:51:21 -0700 (PDT) Received: from tbd.gfoster.com (dyna237.intr.net [204.157.123.237]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id FAA11429 for ; Thu, 22 Aug 1996 05:51:16 -0700 (PDT) Received: (from gfoster@localhost) by tbd.gfoster.com (8.7.5/8.6.12) id IAA02195; Thu, 22 Aug 1996 08:50:50 -0400 (EDT) Date: Thu, 22 Aug 1996 08:50:50 -0400 (EDT) From: Glen Foster Message-Id: <199608221250.IAA02195@tbd.gfoster.com> To: freebsd-hardware@FreeBSD.ORG In-reply-to: <199608220336.AA169064976@hpnmhjw.sr.hp.com> (message from Darryl Okahata on Wed, 21 Aug 1996 20:36:15 -0700) Subject: Re: SCSI again: Asus SC200 vs. Adaptec 2940 ... Sender: owner-hardware@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk A couple of data points with Adaptec 2940s: ***** Bonnie: -------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 P166 100 1414 23.8 1356 5.1 700 4.3 1736 27.5 2081 7.7 42.7 1.9 ***** IOZONE: Writing the 128 Megabyte file, 'iozone.tmp'...96.320312 seconds Reading the file...66.140625 seconds IOZONE performance measurements: 1393451 bytes/second for writing the file 2029278 bytes/second for reading the file Machine is a P166, with 64MB 60ns parity DRAM, ASUS P55T2P4 w/256K PB cache, a 1GB Fujitsu M2266S-512 002C, and an Adaptec 2940 SCSI controller running 2.1.5R. Disk was about 3/4 full at start of test. This drive is an older 5 1/4" 3600 RPM drive that is not doing syncronous transfers, if I get a wild hair I'll flop some jumpers and see if sync xfers can be enabled. ***** Bonnie: -------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 P100 100 2056 51.4 4226 19.3 1609 12.9 2076 50.7 4291 19.7 72.1 3.9 ***** IOZONE: Writing the 256 Megabyte file, 'iozone.tmp'...96.984375 seconds Reading the file...63.914062 seconds IOZONE performance measurements: 2767821 bytes/second for writing the file 4199943 bytes/second for reading the file Machine is a P100, with 32MB 70ns non-parity DRAM, unknown MB w/256K PB cache, a 2GB Seagate ST32430N 0300, and an Adaptec 2940 running 2.1.5R. Disk was about 1/2 full at start of test. Without trying to get too deep into the numbers, I think one could say that one's money is more effectively spent on disk, RAM, and CPU than on a "better" SCSI controller. >Date: Wed, 21 Aug 1996 20:36:15 -0700 >From: Darryl Okahata > >> How do these two boards actually compare? Disregarding drivers >> are they fairly similar in capability and speed? > > The NCR driver is quite nice. It's certainly hard to go wrong for >the money. Here are some benchmarks, using an NCR815-based controller: > >------------------------------------------------------------------------------- >***** Bonnie: > -------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 >PCI/Q4.0 256 3350 66.8 3387 14.8 2027 15.9 4671 90.0 6065 24.6 87.5 4.1 > >***** IOZONE: >$ time iozone 256 > >Writing the 256 Megabyte file, 'iozone.tmp'...77.492188 seconds >Reading the file...43.460938 seconds > >IOZONE performance measurements: > 3464032 bytes/second for writing the file > 6176476 bytes/second for reading the file >------------------------------------------------------------------------------- > >This is on a P133, with 64MB 60ns parity FPM DRAM, ASUS P55T2P4 w/512K >PB cache, a 4GB Quantum Atlas (34300S), and a DTC 3130B SCSI controller. >Note that these measurements were *NOT* done on the outer tracks of the >drive; the drive was half-full when these benchmarks were done, and so >I'd guess that they were done around the tracks 1/3 of the way in.