[TUHS] 2.9bsd with networking on 18-bit possible?
jnc at mercury.lcs.mit.edu
Wed Dec 12 02:57:07 AEST 2018
> IIRC, outbound packets are copied into kernel buffers
IDRC; according to the documentation, outbound packets are DMA'd directly from
user memory. I have yet to read the code to verify this.
> we must have added PTY's of some sort
There is indeed a PTY driver; it has comments from BBN'ers who edited it, so
perhaps we got it from BBN.
> I don't remember which one SMTP used.
The 'simple' TCP.
> The whole thing worked _really_ well. Alas, I don't think anyone else
> picked up on it.
So I found a long list of people we sent tapes to. Oh well....
> The kernel code is not that large, it should even run on a /40, without
> overlays (although the number of disk buffers would probably get hit).
Well, maybe... Here is the output of 'size' on the last Unix image for that
It was a /45, so split I/D (no overlays, though). How much could be trimmed
out of that, I'm not sure.
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