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From: arnold@skeeve.com
To: tuhs@minnie.tuhs.org, lyndon@orthanc.ca, ben@cogs.com
Subject: Re: [TUHS] CMU Mach sources?
Date: Thu, 27 Jun 2019 04:59:34 -0600	[thread overview]
Message-ID: <201906271059.x5RAxZZ4020844@freefriends.org> (raw)
In-Reply-To: <8249B608-606A-4A32-8D56-D78F16BC217B@cogs.com>

Larry McVoy writes:
> >> OK, I'll bite.  Go read the source in the FreeBSD tree, which has been 
> >> reduced in size by 60% according to someone on the team.  Then come
> >> back and draw me a picture of what it does.

On Jun 27, 2019, at 12:01 AM, Lyndon Nerenberg <lyndon@orthanc.ca> wrote:
> > Larry, it seems to me your argument is the Mach code should never
> > have been incorporated into BSD in the first place.  That's fine,
> > but it's not the Mach developers fault that happened, so maybe you
> > should lay off them for not writing their research software to a
> > production shop standard they were never a part of?

Ben Greenfield via TUHS <tuhs@minnie.tuhs.org> wrote:
>  My understanding is that the  BSD layer was a requirement from DARPA.
> DARPA wanted a “normal” interface to the kernel and BSD was that interface.

Yes, Mach had to provide a BSD layer on top, but that's not the source
of Larry's gripes.

It's the other way around. 4.4 BSD pulled the VM code out of Mach and
into BSD to provide mmap and some level of portability off the Vax. From
there the Mach code got into FreeBSD.  That's what Larry is complaining
about and what Lyndon is saying isn't fair to the Mach guys.

Thanks,

Arnold

  reply	other threads:[~2019-06-27 11:00 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-23  4:38 Chris Hanson
2019-06-23  5:15 ` Larry McVoy
2019-06-23  8:52   ` Andrew Warkentin
2019-06-23 13:39   ` Jon Forrest
2019-06-23 13:59     ` arnold
2019-06-23 14:03     ` Jason Stevens
2019-06-23  8:04 ` Jason Stevens
2019-06-23 14:54   ` Henry Bent
2019-06-23 21:52     ` Clem Cole
2019-06-25  0:06       ` Larry McVoy
2019-06-25  0:31         ` Theodore Ts'o
2019-06-25  0:45           ` Larry McVoy
2019-06-25  0:55             ` Kurt H Maier
2019-06-25  4:18               ` Larry McVoy
2019-06-26 23:19                 ` [TUHS] Craft vs Research (Re: " Bakul Shah
2019-06-27  0:16                   ` tuhs
2019-06-27 17:06                     ` Clem Cole
2019-06-25  1:00             ` [TUHS] " Richard Salz
2019-06-25  8:00               ` Kevin Bowling
2019-06-25 12:11                 ` Arthur Krewat
2019-06-25 12:17                   ` Arthur Krewat
2019-06-26  2:45               ` Kurt H Maier
2019-06-26  2:56                 ` Larry McVoy
2019-06-26 15:11                   ` Theodore Ts'o
2019-06-26 17:44                     ` Larry McVoy
2019-06-26 18:01                       ` arnold
2019-06-26 18:18                         ` Warner Losh
2019-06-26 19:22                       ` Chris Hanson
2019-06-26 19:32                         ` Ben Greenfield via TUHS
2019-06-26 20:21                           ` Larry McVoy
2019-06-27  0:22                             ` Chris Hanson
2019-06-27  1:02                               ` Larry McVoy
2019-06-27  1:26                                 ` Chris Hanson
2019-06-27  4:01                             ` Lyndon Nerenberg
2019-06-27 10:34                               ` Ben Greenfield via TUHS
2019-06-27 10:59                                 ` arnold [this message]
2019-06-27 11:13                                   ` Ben Greenfield via TUHS
2019-06-27 11:39                                     ` arnold
2019-06-27 14:58                                     ` Warner Losh
2019-06-27 17:25                                       ` Larry McVoy
2019-06-26 19:30                       ` Dennis Boone
2019-06-26 19:25                     ` Adam Thornton
2019-06-23  8:27 ` Kevin Bowling
2019-06-25  3:07 ` Gregg Levine
2019-06-25  8:15   ` Kevin Bowling
2019-06-25 18:18   ` Chris Hanson
2019-06-25 20:23     ` Gregg Levine
2019-06-26  1:04       ` Jason Stevens
2019-06-26  0:53     ` Jason Stevens
2019-06-25  7:49 ` Jason Stevens
2019-06-25  7:59   ` Andreas Grapentin
2019-06-23 22:08 Noel Chiappa
2019-06-23 23:54 ` Theodore Ts'o
2019-06-24 17:04   ` Jason Stevens
2019-07-01 13:20 Jason Stevens

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