From owner-freebsd-current Sun Aug 10 00:14:49 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id AAA07487 for current-outgoing; Sun, 10 Aug 1997 00:14:49 -0700 (PDT) Received: from MindBender.serv.net (root@mindbender.serv.net [205.153.153.98]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id AAA07481 for ; Sun, 10 Aug 1997 00:14:45 -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 AAA04251; Sun, 10 Aug 1997 00:14:30 -0700 (PDT) Message-Id: <199708100714.AAA04251@MindBender.serv.net> X-Authentication-Warning: MindBender.serv.net: Host michaelv@localhost.HeadCandy.com [127.0.0.1] didn't use HELO protocol To: Peter Mutsaers cc: freebsd-current@freebsd.org Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) In-reply-to: Your message of 09 Aug 97 00:54:13 +0200. <877mdw2smi.fsf@plm.xs4all.nl> Date: Sun, 10 Aug 1997 00:14:29 -0700 From: "Michael L. VanLoon -- HeadCandy.com" Sender: owner-freebsd-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >>> On Thu, 7 Aug 1997 23:27:18 -0500 (EST), "John S. Dyson" >>> said: > JSD> This is the result of my "slow" recent, but not the latest, greatest > JSD> IDE drive (WD 4GB drive.): > JSD> dd if=/dev/rwd1 of=/dev/null count=1600 bs=64k > JSD> 104857600 bytes transferred in 10.881267 secs (9636525 bytes/sec) >Hmm, my NCR815 does: >~> dd if=/dev/rsd2 of=/dev/null count=1600 bs=64k >104857600 bytes transferred in 15.215823 secs (6891352 bytes/sec) >This is a seagate ST15150N. >But for Wide and/or Ultra SCSI you can expect better values. > >More interesting is: > >~> dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k&;dd if=/dev/rsd0 of=/dev/nul l count=1600 bs=64k& >i.e. start two of them at the same time. >I get as result: >104857600 bytes transferred in 41.430049 secs (2530955 bytes/sec) >104857600 bytes transferred in 41.437855 secs (2530478 bytes/sec) What would be much more interesting to me is if you would do this on a four-drive ccd stripe-set, both with Ultra-Wide SCSI and "UltraIDE". It would be interesting to have a process running non-stop, measuring the amount of left-over CPU, at the same time. ----------------------------------------------------------------------------- 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... -----------------------------------------------------------------------------