From mboxrd@z Thu Jan 1 00:00:00 1970 From: pnr@planet.nl (Paul Ruizendaal) Date: Thu, 1 Dec 2016 21:13:49 +0100 Subject: [TUHS] looking for 4.1a BSD full kernel source In-Reply-To: References: <0f3795f4-fb98-3370-510c-347a272dddae@aueb.gr> <38CA85C9-C005-49C5-8BD5-3FC65FC170BF@planet.nl> Message-ID: Clem, Many thanks for your informative post! > Assuming I can read the tape, I know I do have a copy of 4.1a distribution on 9-track. That is great news. Let me know once you had a chance to look at it. I am in no hurry, so whenever you have time, even if that is months from now. > Diomidis is correct, 4.1a use Joy/Cooper/Leffler reimplementation of of the BBN stack, not the original BBN stack. I suspected as much, but I am happy to hear it confirmed. I've been told on several occasions that 4.1a contained the original BBN stack. > The BBN stack (Gurwitz et al) was for 4.1 (and other UNIX and non-Unix systems). I do not believe I have a copy of that tape. Rob or maybe Eric Cooper might. > > How Sam added the code into the UCB SCCS, I never knew (you can ask him directly, he is still findable these days). Eric Cooper took the basic BBN distribution and put it on the UCB 4.1 systems around campus >>before<< Joy started the sockets work i.e. the installation was done by installing 4.1, then taking the BBN tape and installing it as is. I can confirm all this. I do have several copies of the BBN tapes from '81 and '82, they survived in Kirk McKusick's archive. They indeed contain material that is 'copied over' a clean 4 or 4.1 build tree. The first complete BBN beta is from May 1981 and Joy started on his network code in October 1981. > BTW: about 3 years later, the BBN2 stack comes out from Rob and team and it is actually even more interesting; because it now uses the sockets interface (not the Chaosnet/UofI nami trick), and adds a number of both performance enhancements (Van Jacobson's work, etc.) as well as a more complete implementation of the IP stack. I >>might<< have a copy of that tape squirreled away; but I'll have to look. I think this might be the material that appears in the BSD source tree in 1985, right? Van Jacobson's work is ~1988, I think, but I could well be mistaken. I think the main performance improvement between the 1982 and the 1985 version was a switch from a kernel thread model to a software interrupt model, but as yet I haven't grasped why this is better and my assumption may be incorrect. Paul