From owner-freebsd-questions Wed Apr 26 13:18:51 1995 Return-Path: questions-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id NAA24470 for questions-outgoing; Wed, 26 Apr 1995 13:18:51 -0700 Received: from haven.uniserve.com (haven.uniserve.com [198.53.215.121]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id NAA24458 for ; Wed, 26 Apr 1995 13:18:38 -0700 Received: by haven.uniserve.com id <210>; Wed, 26 Apr 1995 13:30:44 -0700 Date: Wed, 26 Apr 1995 13:29:50 -0700 (PDT) From: Tom Samplonius To: Bob Willcox cc: questions@FreeBSD.org Subject: Re: BT946C strangeness In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: questions-owner@FreeBSD.org Precedence: bulk On Wed, 26 Apr 1995, Bob Willcox wrote: > What is your read performance? The write speed of my DSP3210S's > was about 1.5meg/sec before I enabled their write caching (the > DSP3210S defaults to not caching writes). With the write caching > enabled I get about 4.5meg/sec (and about 4meg/sec read, though > that didn't change). This is on a BT-747S controller. The raw read performance (using "dd") was 3511650 bytes/s. Using "iozone 100" would yield about 1.7 MB/s for both read and write. > BTW, one enables the write caching by setting a bit in mode page > 8 (as I recall). Also, for DEC drives you have to reset a bit in > mode page 2. Email me if you would like some instructions and a > program I got from a person at DEC you can use to do this. I would very much like to see this info. Tom