> Is Plan9 has a microkernel architecture?
with Plan 9 the adjective is more important than the compound noun,
so it's micro and modular, but not a `microkernel'.
most of the microkernels are (probably) much more
elaborate, and indeed simply much more.
in an apparently under-read paper, it was observed that:
The UNIX kernel is an I/O multiplexer more than
a complete operating system. This is as it should be.
Because of this outlook, many features are
found in most other operating systems that are missing
from the UNIX kernel.
Plan 9 goes further, removing even the storage subsystems
from the kernel, and making it a name-space multiplexor,
as much as (or more than) an IO multiplexor, with its focus
on a single protocol.
