There used to be a lot of "special microkernel on compute RPCing to Linux on I/O" on Crays and the like. Hard to say how prevalent it is now, and most annoyingl

There used to be a lot of "special microkernel on compute RPCing to Linux on I/O" on Crays and the like. Hard to say how prevalent it is now, and most annoyingly I can't recall the names. (Charon?)