From: pnr@planet.nl (Paul Ruizendaal)
Subject: [TUHS] Unix with TCP/IP for small PDP-11s
Date: Tue, 23 May 2017 13:35:02 +0200 [thread overview]
Message-ID: <12C21350-E009-46A8-B50F-76D2AA6A8CF7@planet.nl> (raw)
>> There are two other routes to TCP/IP on a PDP11 without split I/D:
>> ...
>> DCEC's adaptation of the Wingfield TCP/IP library, designed to work
>> with V6. It is mostly a user space daemon, but requires some kernel
>> enhancements.
>
> I wonder what the performance would be like, since the TCP is in a user
> process (a different one from the application), i.e. there's a process switch
> every time the application goes to send or receive data. This wouldn't have
> been such an issue when the code was written, since ARPANet-type networks
> were not very fast, but with a better network, it would have been limiting.
IEN98 (http://www.rfc-editor.org/rfc/ien/ien98.txt, page 2) has the answer: about 10kb/s.
The DCEC version used shared memory instead of rand ports and was claimed to be
a bit more performant, but I have no number. I'd be surprised if it was twice as fast,
so perhaps 15kb/s.
Paul
next reply other threads:[~2017-05-23 11:35 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-23 11:35 Paul Ruizendaal [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-05-24 15:21 Noel Chiappa
2017-05-24 17:19 ` Jeremy C. Reed
[not found] <mailman.1.1495591202.25149.tuhs@minnie.tuhs.org>
2017-05-24 9:20 ` Paul Ruizendaal
2017-05-23 13:43 Noel Chiappa
2017-05-23 1:33 Noel Chiappa
2017-05-23 1:14 Noel Chiappa
2017-05-22 9:28 Paul Ruizendaal
2017-05-22 14:09 ` Clem Cole
2017-05-22 14:51 ` Steve Simon
2017-05-22 16:29 ` Clem Cole
2017-05-22 16:35 ` Ron Natalie
2017-05-22 22:07 ` Paul Ruizendaal
2017-05-22 23:25 ` Clem Cole
2017-05-23 0:36 ` Paul Ruizendaal
[not found] <mailman.1.1495245601.20449.tuhs@minnie.tuhs.org>
2017-05-20 10:46 ` Johnny Billquist
2017-05-20 17:39 ` Henry Bent
2017-05-20 20:40 ` Johnny Billquist
2017-05-20 20:44 ` Henry Bent
2017-05-20 18:18 ` Warner Losh
2017-05-20 19:05 ` arnold
2017-05-20 20:29 ` Warner Losh
2017-05-20 21:41 ` David Arnold
2017-05-20 21:59 ` Erik E. Fair
2017-05-20 20:40 ` Johnny Billquist
2017-05-20 21:05 ` Warner Losh
2017-05-20 21:34 ` Johnny Billquist
2017-05-21 5:13 ` Random832
2017-05-21 11:04 ` Ron Natalie
2017-05-19 15:15 Noel Chiappa
2017-05-19 16:29 ` Henry Bent
2017-05-19 19:04 ` Ron Natalie
2017-05-20 0:15 ` Warner Losh
2017-05-20 0:21 ` Warner Losh
2017-05-19 17:39 ` Clem Cole
2017-05-21 16:16 ` Dave Horsfall
2017-05-21 19:58 ` Clem Cole
2017-05-21 20:57 ` Ron Natalie
2017-05-21 21:26 ` Clem Cole
2017-05-21 21:46 ` William Pechter
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