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From: h112706@assari.tut.fi (Herranen Henrik)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga competitiveness
Message-ID: <1990Sep30.073948.25984@assari.tut.fi>
Date: 30 Sep 90 07:39:48 GMT
References: <90271.190320UH2@psuvm.psu.edu> <420@caslon.cs.arizona.edu> <1091@ucsvc.ucs.unimelb.edu.au>
Organization: Tampere University of Technology
Lines: 55


In article <1091@ucsvc.ucs.unimelb.edu.au> U3364521@ucsvc.ucs.unimelb.edu.au (Lou Cavallo) writes:
>G'day,
>
>CJ> In article <420@caslon.cs.arizona.edu>, cjeffery@cs.arizona.edu
>CJ> (Clinton Jeffery) writes:
>
>CJ> Example #2: an Amiga's hard disk, even with FFS, is *ridiculously* slow
>CJ> 	compared to the _identical_ hard disk running DOS or UNIX/386.  This
>CJ> 	is based on empirical observation doing heavy C compiles on a 2000
>CJ> 	with 1MB ram and a 40 Meg ST-251-1.  Sorry.  I wish it were untrue.
>
>Clint, could you give the specs behind this claim please?
>
>What was the controller on the DOS or UNIX system?
>What was the controller on the Amiga system?
>
>I have seen a Quantum 40 Meg equipped 386 DX apparently out perform (2 Mbits
>per sec benchmark) quoted A2000 Quantum 40 Meg throughputs but the 386 had a
>32 bit buss... {which qualitatively explains its approx 2x throughput over a
>16 bit A2000 buss}.

Well, if you think 2 Mbits per sec is fast then my Hard Frame controller is
divinely fast. 2MBits/s = 200 kBytes/s, and my Hard Frame with 105 MB Quantum
reads about 690 kB/s according to one of my test programs (the one I wrote
myself, of course ;-) ).
   And 690 kBytes/s is more than I've ever seen my friend's 25 MHz 386 do
(compared to my 7 MHz 68010).

>One would naturally assume that such a difference for a comparison b/w any 2
>PC systems should be controller/PCbuss related. For our proper analysis we'd
>need to know the controller specifics.
>
>Are we comparing a 386-SX to an Amiga 2000 which is the closest comparison ?
>{A 386DX with SCSI buss and QuantumHD would be a good comparison to a 3000.}
>
>Moreover as Dave Haynie could attest to, the A2000 Zorro II buss is old news
>in todays terms. The new Zorro III buss hits 20 Mbits/sec (Dave?) and Acorns
>ARM III chipset can hit about 38 Mbits/sec I think (can validate anyone ?).

The output of the Zorro III bus is certainly ar least 10 times more than 20
MBits/s (the same error again. Let's all say this loud and clear just to
remember: "BIT <> BYTE").

>CJ> Clint Jeffery, U. of Arizona Dept. of Computer Science
>CJ> cjeffery@cs.arizona.edu -or- {noao allegra}!arizona!cjeffery
>
>yours truly,
>Lou Cavallo.

Regards, Henrik
-- 
Name:     Henrik 'Leopold' Herranen  h112706@lehtori.tut.fi
Address:  TTKK/P{{rakennuksen neuvonta/PL527/33101 Tampere/Suomi Finlandia

"On d{htinen daevas ja kuutamoy|, on morsiamelta katkaistu p{{"   E.L.1989