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From: vallon@sbcs.sunysb.edu (Justin Vallon)
Newsgroups: comp.sys.mac
Subject: Re: Quantum ROM "FIX" benchmark!
Message-ID: <3916@sbcs.sunysb.edu>
Date: 12 Nov 89 23:26:05 GMT
References: <14527@well.UUCP>
Sender: news@sbcs.sunysb.edu
Reply-To: vallon@sblw.UUCP (Justin Vallon)
Organization: State University of New York at Stony Brook
Lines: 28

In article <14527@well.UUCP> espen@well.UUCP (Peter Espen) writes:
>
> The info in the following graph was generated by "SCSI Evaluator 1.01" and
>clearly shows the amount of performance degradation that takes place when
>my 80 Meg Quantum with the new ROMS is doing it's "exercise routines".
> The normal data was taken when the drive was acting normally, and the degraded 
>data was generated while the new ROM routines were taking place. Remember that
>these exercise routines occur at random times, and can sometimes go for a 
>long time. NICE "FIX", HUH!!!
>
>
>	View the following graph using Monaco 9 point......
>

[ Graph that shows normal & degraded performance.  The normal performance ]
[ starts at 20Mbits/sec, and slopes from 20M to 8M from 20Kbytes to 8K ]
[ and 8M from 25- ]

I'm curious.  I am not doubting that this graph is correct, but I have
a question.  I thought that the SCSI chip maximum data transfer rate was
about 1.4 Mb(ytes)/sec.  That's about 11-12 Mbits/sec.  How do you get
20Mbits/sec transfer?  I have a Mac II.  Do the IIx/cx/ci's have faster
SCSI chips?

Just wondering...

-Justin
vallon@sbcs.sunysb.edu