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 <lchg567@gmail.com> 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 consideration for this? Just for performance, or some other reasons?
> And is there a relatively easy solution to move the stack to user space?
>