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From: Richard Salz <rich.salz@gmail.com>
To: Clem Cole <clemc@ccc.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>,
	Bakul Shah <bakul@iitbombay.org>
Subject: Re: [TUHS] 386BSD released
Date: Fri, 16 Jul 2021 16:24:10 -0400	[thread overview]
Message-ID: <CAFH29trY2ZBcssDawauQWMEKzLc+7ZVeVOcXWc_50et7LcFtHw@mail.gmail.com> (raw)
In-Reply-To: <CAC20D2M7ytkKEwTeBvZySJtr2XLNiQjphhJ-66ZTuKfsviJHOw@mail.gmail.com>

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Anyone remember the old mtXinu calendar with fake ads?I only remember one
page, "oh no Spot(?) spilled the mbufs, Dad's favorite cereal."

On Fri, Jul 16, 2021, 4:19 PM Clem Cole <clemc@ccc.com> wrote:

>
>
> On Fri, Jul 16, 2021 at 3:08 PM Kevin Bowling <kevin.bowling@kev009.com>
> wrote:
>
>> Yup was just going to say this is standard in the modern BSD network
>> drivers, looks like Clem says it's older.
>
> Absolutely -- I believe it was Rob's undergrad project at Brown that he
> brought to BBN.
>
> The first use, if I saw, was the 'portable IP/TCP' stack  BBN did for
> HP/3000 and a couple of other systems.  That code seems to have been lost.
> I have asked about it on the Internet history mailing list.  I had a copy
> of it one time, but sadly I don't think I still do.  IIRC The original
> PDP-11 IP implementation which ran on a couple of dedicated systems,
> whose names/function I frankly do not remember) was also based on a version
> of this code.  I think it ran something like RT-11 or DOS-11 and then
> started the IP code -- basically RTR style today.   Later it morphed into
> Rob's Vax BSD  4.1 specific stack,  which we ran at UCB on a couple of the
> systems using 3M Xerox board.  This latest until 4.1A and Joy's rewrite and
> I want to say we switched in Interlan 10M boards then.  We have a couple of
> the 3Com boards, but because of the lack of buffering, they were a bear to
> use and stopped as soon as we got the Interlan one.
>
>
> Anyway, all of these IP/TCP stacks used Rob's mbuf code.  Which was a
> blessing and a curse.  By writing his own, he avoids huge
> changes/integration into the memory system, but it also helped to make BSD
> such a mess under the covers because there were so many private memory
> managers between the network, the I/O systems etc...  As discussed
> previously on the TUHS list, the one thing Risner really did well had a
> uniform memory design.   Later BSD's moved to Mach and tried to clean this
> up a little, but the network code was by then so screwed into Rob's mbuf
> scheme, it stayed around a long time.  Werner -- what is the state of this
> these days in FreeBSD is it still there?
>
>
>
>
>> There are recent optimizations to help the CPU with prefetch, and some
>> ideas around vectors of mbufs.  What's remarkable is the mbuf design
>> scales to
>> 200gbps in practice, it must feel great to design something like that so
>> long ago :)
>>
> Well, ask Rob :-)  I've lost track of him since Stellar, and I think he I
> heard he left high tech but frankly don't know.
>
> Clem
> ᐧ
>

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  reply	other threads:[~2021-07-16 20:24 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
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 [this message]
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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