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From: Clem Cole <clemc@ccc.com>
To: Larry McVoy <lm@mcvoy.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>,
	Bakul Shah <bakul@iitbombay.org>
Subject: Re: [TUHS] 386BSD released
Date: Fri, 16 Jul 2021 10:40:56 -0400	[thread overview]
Message-ID: <CAC20D2O=LuFMFdShXidPyJDTZvfbdJb9DN5ouXTBA-ScFtwNJA@mail.gmail.com> (raw)
In-Reply-To: <20210716135639.GI12733@mcvoy.com>

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On Fri, Jul 16, 2021 at 9:57 AM Larry McVoy <lm@mcvoy.com> wrote:

> I'm pretty sure SGI used a similar approach for networking packets.
>

Yeah, it was pretty standard for networking interfaces.  I think I first
saw it I'm the MIT Chaos driver maybe?  In many ways,  Gurwitz's whole mbuf
memory scheme for the ethernet controllers and the whole IP stack that
lives on in BSD is based on the idea.  Rob used a number of different size
buffers, not just the two, but the idea is the same, never copy anything if
we can avoid it.   Play pointer games in the top, bottom, and middle parts
of the driver/stack.

A huge difference, as Ted I'm sure knows, is that you tended to have many
more serial lines than network interfaces.  I suspect Rob's scheme
would have sucked trying to support traditional single-byte serial
interfaces or really just use too much memory to be practical.
ᐧ

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  reply	other threads:[~2021-07-16 14:41 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 22:28 Dave Horsfall
2021-07-14  7:54 ` Michael Kjörling
2021-07-14  8:19   ` Angus Robinson
2021-07-14  8:32     ` Michael Kjörling
2021-07-14  9:07       ` Lars Brinkhoff
2021-07-14 14:09         ` Larry McVoy
2021-07-14 14:54           ` Warner Losh
2021-07-14 15:06             ` Richard Salz
2021-07-14 15:37             ` Steve Nickolas
2021-07-14 10:09       ` Tom Ivar Helbekkmo via TUHS
2021-07-14 10:39         ` arnold
2021-07-14 17:21         ` Lyndon Nerenberg (VE7TFX/VE6BBM)
2021-07-14 17:32           ` Richard Salz
2021-07-14 15:01     ` Clem Cole
2021-07-14 17:40       ` [TUHS] [COFF] " Theodore Y. Ts'o
2021-07-14 17:50         ` Larry McVoy
2021-07-14 18:28         ` Clem Cole
2021-07-14 11:49   ` [TUHS] " Andy Kosela
2021-07-14 15:48     ` Theodore Y. Ts'o
2021-07-16  1:35   ` Dave Horsfall
2021-07-16  2:33     ` risner
2021-07-16  4:25       ` Theodore Y. Ts'o
2021-07-16  5:51         ` Bakul Shah
2021-07-16 13:00           ` Theodore Y. Ts'o
2021-07-16 13:56             ` Larry McVoy
2021-07-16 14:40               ` Clem Cole [this message]
2021-07-16 15:44                 ` Theodore Y. Ts'o
2021-07-16 16:11               ` Bakul Shah
2021-07-16 19:07               ` Kevin Bowling
2021-07-16 20:17                 ` Clem Cole
2021-07-16 20:24                   ` Richard Salz
2021-07-18 13:13                     ` arnold
2021-07-18 13:23                       ` Richard Salz
2021-07-18 13:43                       ` [TUHS] MtXinu calendar (was Re: 386BSD released) Al Kossow
2021-07-18 13:51                         ` Al Kossow
2021-07-18 16:44                         ` Al Kossow
2021-07-18 17:38                           ` John Cowan
2021-07-18 18:35                           ` Bakul Shah
2021-07-19  3:06                             ` Dan Stromberg
2021-07-18 19:00                           ` arnold
2021-07-18 21:48                             ` Deborah Scherrer
2021-07-18 20:06                           ` Lyle Bickley
2021-07-14 21:37 ` [TUHS] 386BSD released Bakul Shah
2021-07-16 21:22 ` Dave Horsfall
2021-07-15  2:21 Douglas McIlroy
2021-07-15  2:41 ` Adam Thornton
2021-07-15 15:07 ` Clem Cole
2021-07-16 17:30 Nelson H. F. Beebe

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