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From: Lynn Wheeler <lynn@garlic.com>
Newsgroups: alt.folklore.computers,comp.os.linux.misc
Subject: Re: The joy of FORTRAN
Date: Fri, 27 Sep 2024 09:55:38 -1000
Organization: Wheeler&Wheeler
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Peter Flass <peter_flass@yahoo.com> writes:
> As Lynne will be happy to tell you, the original IBM TCP/IP implementation
> was written in IBM Pascal for VM/CMS.

The IBM communication group was fiercely fighting off client/server and
distributed computing and trying to block mainframe TCP/IP release. When
that got overturned they changed their tactic and claimed that since
they had corporate strategic responsibility for everything that crossed
datacenter walls, it had to be release through them. What shipped got
aggregate 44kbytes/sec using nearly whole 3090 processor. It was also
made available on MVS by doing MVS VM370 "diagnose" instruction
simulation.

I then do RFC1044 implementation and in some tuning tests at Cray
Research between Cray and IBM 4341, get 4341 sustained channel
throughput using only modest amount of 4341 CPU (something like 500
times improvement in bytes moved per instruction executed).

In the 90s, the IBM communication group hires a silicon contractor to
implement tcp/ip support directly in VTAM, what he demo'ed had TCP
running much faster than LU6.2. He was then told that everybody knows
that LU6.2 is much faster than a "proper" TCP/IP implementation and they
would only be paying for a "proper" implementation.

-- 
virtualization experience starting Jan1968, online at home since Mar1970