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From: davidb@brac.inmos.co.uk (David Boreham)
Newsgroups: comp.sys.transputer
Subject: Re: host/transputer link speeds?
Message-ID: <16455@ganymede.inmos.co.uk>
Date: 6 Jun 91 11:40:22 GMT
References: <1991Jun4.133704.21008@cmcl2.nyu.edu> <16425@ganymede.inmos.co.uk> <3589@kraftbus.cs.tu-berlin.de>
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In article <3589@kraftbus.cs.tu-berlin.de> stewe@opal.cs.tu-berlin.de (Stephan Wenger) writes:
>
>It is possible to build a link-interface for the AT-Bus, which easily
>realizes a overall bandwith (unidirectional) of more than one MB/s.
>We have build such a thing around a C011 link-adaptor and two
>IDT 7204 4096x9 bit hardware Fifos. The biggest problem was, that you
>have to build a 16-bit AT interface, since the 8 bit XT interface is
>too slow.
>With this design we realize about 1.2 MB/s transfer rate between two
                                   ^^^^^^^^
>of this adaptors. We have never connected it to a transputer, but i
>think, that the transputer would not be the bottleneck.
                                           

Hmm. This sounds too high. I've never done any detailed measurements
but simulations predict no more than 1Mbyte/s from any link adaptor 
under any operating conditions. Are you sure you are measuring the
correct thing and that ACKs are matching the right data packets ?

David Boreham, INMOS Limited | mail(uk): davidb@inmos.co.uk or ukc!inmos!davidb
Bristol,  England            |     (us): uunet!inmos.com!davidb
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