[TUHS] update pdp11 system five?

[Larry McVoy via TUHS]

On Wed, Dec 17, 2025 at 02:09:28PM -0500, Clem Cole via TUHS wrote:
> With SVR3. Stream-based networking using the Transport Layer Interface
> (TLI) was added, but an IP/TCP stack was not provided.  A number of folks
> such as Lachman offered them

So far as I know, Lachman didn't write their stack, they bought it from
Convergent.  The internet says it was a joint development but my memory is
Lachman bought a working stack.

The only other STREAMS based TCP/IP stack I'm aware of is the Mentat one
that was done for Sun, after some Sun VP, Larry somebody, paid Lachman a
ton of money for theirs only to discover that the performance absolutely
sucked.  I did a little digging, Mentat made their own implementation of
STREAMS because the Sys V one really sucked.  I'm a little vague on the
details but I think STREAMS queued at each layer so all the overhead
was taking it off one layer's queue and putting it on a different
layer's queue.

Is anyone aware of a STREAMS TCP/IP besides the Lachman/Convergent and
the Mentat ones?

And in defense of Dennis' streams that USG morphed into STREAMS, he
intended it for tty interfaces, not for networking.  Ttys were slow
enough that the queuing was fine.

--lm