From owner-freebsd-current Thu Oct 31 23:32:50 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id XAA27193 for current-outgoing; Thu, 31 Oct 1996 23:32:50 -0800 (PST) Received: from nexgen.n4hhe.ampr.org (max14-188.HiWAAY.net [206.104.17.188]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id XAA27177 for ; Thu, 31 Oct 1996 23:32:44 -0800 (PST) Received: (from dkelly@localhost) by nexgen.n4hhe.ampr.org (8.7.5/8.7.3) id BAA14155; Fri, 1 Nov 1996 01:32:31 -0600 (CST) Message-ID: X-Mailer: XFMail 0.5-alpha [p0] on FreeBSD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit MIME-Version: 1.0 In-Reply-To: <199611010621.WAA12836@superior.truenorth.org> Date: Fri, 01 Nov 1996 01:12:00 -0600 (CST) Organization: Amateur Radio N4HHE, Madison, AL. From: David Kelly To: Josef Grosch Subject: SCSI and IDE (was Re: 2.1.5r -> current upgrade) Cc: current@freebsd.org, roberto@keltia.freenix.fr, jlemon@americantv.com, jgrosch@sirius.com, (Michael L. VanLoon -- HeadCandy.com) Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On 04:21:39 Josef Grosch wrote: >>>3 hours, 15 minutes is about I get on a make world of the Mayday >>>snapshot. I have an ASUS P55T2P4 Triton II 586-120MHz with 16 Meg of ram, >>>512K L2 cache, Adptec 1542cf SCSI controller and 2 1-gig drives. >> >>Ack! You could do better! Throw away that old ISA piece of trash and >>get a PCI SCSI controller. You should be able to get an NCR/Symbios >>53c810 based card for less than $100 from whoever you bought your Asus >>motherboard from. There is a very definite difference in disk >>performance. Especially if your hard drive(s) support tagged-command- >>queuing. >> > >My new 2940 is sitting right here. I upgrade this weekend. I was trying to >point out that even with a clunker of a controller card one can still get >half way decent performance with a good 586 motherboard. System simply has some unused hardware removed from GENERIC but none of the changes since the SNAP: FreeBSD 2.2-961014-SNAP #0: Wed Oct 30 12:12:30 CST 1996 dkelly@PeeCee.tbe.com:/usr/src/sys/compile/PEECEE Speaking of SCSI, I was playing today with IDE and SCSI on my new AMD 586/133 PCI MB. The SCSI is on a 2940, bios rev 1.10 or so: (ahc0:0:0): "SEAGATE ST3610N 9290" type 0 fixed SCSI 2 sd0(ahc0:0:0): Direct-Access 510MB (1046206 512 byte sectors) The IDE is an old mode 0 drive on the MB EIDE controller: wdc0: unit 0 (wd0): wd0: 486MB (996912 sectors), 989 cyls, 16 heads, 63 S/T, 512 B/S The system has 32M of memory, its supposed to have 512k of cache but the BIOS only reports 256k (I suspect "WRITE BACK CACHE" on the MB is fake so I added a 256k cache to the cache socket). On the IDE drive: PeeCee: {872} time iozone 32 [snip] IOZONE performance measurements: 1188424 bytes/second for writing the file 2111586 bytes/second for reading the file 0.2u 10.8s 0:44.54 24.7% 69+750k 374+542io 0pf+0w Now on to the SCSI drive: PeeCee: {873} cd /usr1 PeeCee: {874} time iozone 32 [snip] IOZONE performance measurements: 3455323 bytes/second for writing the file 4149726 bytes/second for reading the file 0.2u 10.9s 0:18.17 61.5% 26+281k 363+533io 0pf+0w ^^^^ this is the interesting part. Notice how both took the same amount of system time? (nit pickers: SCSI took 0.1 second longer.) I'm disappointed. A bit. BTW, tried a 1542CF first thing after upgrading to the SNAP and upgrading the MB from a 486DX33 that wouldn't host a bus master card. Iozone reported thruput about the same as the IDE. Didn't think to do the "time" part. And I don't think I'm interested enough to take it apart and put the 1542CF back in. -- David Kelly N4HHE, dkelly@tomcat1.tbe.com (wk), dkelly@hiwaay.net (hm) ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system.