From owner-freebsd-current Tue Aug 26 11:48:12 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id LAA29663 for current-outgoing; Tue, 26 Aug 1997 11:48:12 -0700 (PDT) Received: from MindBender.serv.net (root@mindbender.serv.net [205.153.153.98]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id LAA29649 for ; Tue, 26 Aug 1997 11:48:05 -0700 (PDT) Received: from localhost.HeadCandy.com (michaelv@localhost.HeadCandy.com [127.0.0.1]) by MindBender.serv.net (8.7.5/8.7.3) with SMTP id LAA23189; Tue, 26 Aug 1997 11:47:36 -0700 (PDT) Message-Id: <199708261847.LAA23189@MindBender.serv.net> X-Authentication-Warning: MindBender.serv.net: Host michaelv@localhost.HeadCandy.com [127.0.0.1] didn't use HELO protocol To: Ollivier Robert cc: current@freebsd.org Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) In-reply-to: Your message of Tue, 26 Aug 97 08:27:26 +0200. <19970826082726.17963@keltia.freenix.fr> Date: Tue, 26 Aug 1997 11:47:35 -0700 From: "Michael L. VanLoon -- HeadCandy.com" Sender: owner-freebsd-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >According to Jordan K. Hubbard: >> Hmmm. If we're going to talk SCSI perf, let's get seriously SCSI here >> then: Quantum XP39100W drive on 2940UW controller: >> root@time-> dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k >> 1600+0 records in >> 1600+0 records out >> 104857600 bytes transferred in 10.974902 secs (9554309 bytes/sec) >Aren't you disappointed ? You're only a mere 2 MB/s faster with a Wide >connection... I'd expect it more in the 14 MB/s range, no ? With a single drive?! I'd think not... I don't believe even a single Cheetah is capable of giving a sustained transfer rate of 14MB/s. Now, with striped drives, accessing the raw striped partition, yes, I'd expect it to really cruse. And, incidently, that is where SCSI really starts to break away from IDE in performance. ----------------------------------------------------------------------------- Michael L. VanLoon michaelv@MindBender.serv.net --< Free your mind and your machine -- NetBSD free un*x >-- NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3, Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32... NetBSD ports in progress: PICA, others... -----------------------------------------------------------------------------