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Tue May 4 09:08:51 PDT 2021

the 2.x series they (re)started from the BSD4-lite code.  Perhaps the 
most notable caracteristic of FreeBSD is it's unified VM/cache; mostly 
the masterpiece of John Dyson. I understand NetBSD was more conservative 
during this particular stage.

About books.. there is "The Design and Implementation of FreeBSD", by 
Kirk McKusick and others.

DragonFly and FreeBSD-5.x have a lot of divergences though, and I doubt 
they are covered in any book.

hope that helps,


Alex Burke wrote:

I have been reading up allot on the history of BSD based operating
systems, and I know that Net/FreeBSDs came from 386BSD 0.1 (based
heavily on 4.3 Net/2 tape with missing files replaced) with patch kits
As I understand it, 386BSD 1.0 was the continuation of 0.1 but with
the kernel modularized. Since I have read that DragonFlyBSD aims to
eventually try to run large components (such as VFS) in user land, I
was wondering whether conceptually they are at all similar? What is
the eventual aim of DragonFlyBSD and userland services?
I realise that this might seem stupid question since the code has
changed so much (4.4BSD-Lite code integrated, VM system...etc) but I
guess this is my attempt to try to understand things better, hopefully
with the aim of one day being able to help in some form.
I also wanted to ask if anybody knew any good books about the
architecture of BSD systems that can be read by someone no already
knowledgeable about kernel design.
Thanks in advance, Alex J Burke

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