New subject: Fwd: Choice of Unix for 11/03 and 11/23+ Systems

24 Sep 2020

...
  V6, as distributed, had no networking at all. There
are two V6 systems with
 networking in TUHS:

  https://minnie.tuhs.org//cgi-bin/utree.pl?file=SRI-NOSC
<https://minnie.tuhs.org//cgi-bin/utree.pl?file=SRI-NOSC>
  https://minnie.tuhs.org//cgi-bin/utree.pl?file=BBN-V6
<https://minnie.tuhs.org//cgi-bin/utree.pl?file=BBN-V6>

 The first is an 'NCP' Unix (unless unless you have an ARPANet); the second is
 a fairly early TCP/IP from BBN (ditto, out of the box; although one could write
 an Ethernet driver for it). 
I’ve also done a port of the BBN VAX stack to V6 (running on a TI990 clone), using a
serial
PPP interface to connect. Experimental, but may have the OP's interest:
https://www.jslite.net/cgi-bin/9995/dir?ci=tip

...
  There's also a fairly nice Internet-capable V6
(well, PWB1, actually) from MIT
 which I keep meaning to upload; it includes SMTP, FTP, etc, etc. I also have
 visions of porting an ARP I wrote to it, and bringing up an Ethernet driver
 for the DEQNA/DELQA, but I've yet to get to any of that. 
I’d love to have a look at that and compare and contrast the approaches.

I’m finding that BBN’s original design, with a separate kernel thread for the network
stack,
is elegant but difficult to tune: too much priority and it crowds out user processes, too
little
and the slow PPP line is not kept busy.

I think I’m beginning to understand why CSRG (and later also BBN) moved to
the interrupt driven structure of 4.2BSD: perhaps it was also difficult to tune for a
VAX with ethernet.

Re: [TUHS] Fwd: Choice of Unix for 11/03 and 11/23+ Systems