it used to be in userspace, but i believe it was moved to the kernel
for performance reasons.
the remaining evidence of the ip stack in the kernel lives on in (at
least) 9front's sysproc.c, where sysexec raises the process priority
if the program is "/ip", which i assume would be the tcp/ip stack
in early versions of plan9 the tcp/ip stack in Streams, inherited (I assume)
from V10.
This turned out not to be as clean nor as efficent as hoped and this was dropped
for a more traditional implementation in later releases. Maybe the bad
experiences
of poor performance informed the decision for
VSTa had a design heavily inspired by 9 and had the net stack at user level.
It was fun to play with it, long ago.
> El 27 ene 2018, a las 8:04, lchg escribió:
>
> In plan9, many os components are moved to user space, even disk file system.
> But the tcp/ip stack is an exception, what's the c
