Article View: comp.arch
Article #21782Re: _really_ ciscy (Futurebus+)
From: Hugh LaMaster
Date: Tue, 19 Dec 1989 17:14
Date: Tue, 19 Dec 1989 17:14
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In article <276@leia.WV.TEK.COM> johnt@opus.WV.TEK.COM (John Theus) writes: >Ok, guys, let's hear some specifics. What is the baggage that will prevent >Futurebus+ from going fast? Where did we blow it? The one word that keeps coming up wrt Futurebus+ is *Arbitration*. I have heard numerous times that FB+ arbitration is extremely hard for mere mortals to understand, and will be either complicated and expensive, or, slow, depending on implementation, *and*, that it will depend on the slowest board in the system. The prospect is, though, that with *reasonable cost* implementations (being, I suppose, that it doesn't materially add to the cost of a $2500 disk controller), FutureBus+ won't be very fast (Someone said ~50MB/sec). So, 500MB/sec is *possible*, but, some folks claim that boards capable of this speed will be extremely expensive. I am repeating what I have heard, but have no independent knowledge myself. Hugh LaMaster, m/s 233-9, UUCP ames!lamaster NASA Ames Research Center ARPA lamaster@ames.arc.nasa.gov Moffett Field, CA 94035 Phone: (415)694-6117
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!uakari.primate.wisc.edu!ames!ames.arc.nasa.gov!lamaster From: lamaster@ames.arc.nasa.gov (Hugh LaMaster) Newsgroups: comp.arch Subject: Re: _really_ ciscy (Futurebus+) Keywords: Futurebus Message-ID: <38508@ames.arc.nasa.gov> Date: 19 Dec 89 17:14:49 GMT References: <7172@pt.cs.cmu.edu> <112400007@uxa.cso.uiuc.edu> <390@blenheim.nsc.com> <411@blenheim.nsc.com> <1328@atha.AthabascaU.CA> <276@leia.WV.TEK.COM> Sender: usenet@ames.arc.nasa.gov Organization: NASA - Ames Research Center Lines: 24