Date: Sat, 8 Jun 1996 14:05:30 -0400 (EDT) From: Peter Dufault <dufault@hda> To: petzi@zit.th-darmstadt.de (Michael Beckmann) Cc: scsi@freebsd.org Subject: Re: Fast SCSI-2 = 6 MB/sec ? Message-ID: <199606081805.OAA22866@hda> In-Reply-To: <Pine.BSF.3.91.960608162724.401A-100000@zit1.zit.th-darmstadt.de> from "Michael Beckmann" at Jun 8, 96 04:39:17 pm
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> > I have just installed a Plextor SCSI CD ROM drive in my machine. I had to > find out that it supports only 6 MB/sec. Here is the output from dmesg: ... > I know that the CD ROM drive can never deliver a throughput of 6 MB/sec, > (actually, it should deliver around 680 kByte/sec.) but I wonder > if the CD ROM drive decreases the performance of the entire bus, thus > limiting the bus throughput to 6 MB/sec. Am I right ? Should I be > concerned about this and replace the CD drive ? No - each device will negotiate its own synchronous rate. The peak burst data rate for that CD will be 6MB, and you have to assume it will will properly disconnect and reconnect to permit effective bus utilization. -- Peter Dufault Real-Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267
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