Micro-kernel. Key points. Microkernel provides minimal abstractions Address space, threads, IPC Abstractions … are machine independent But implementation is hardware dependent Myths about inefficiency of micro-kernel stem from inefficient implementation and not from microkernel approach.
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M2, A2, P2
M1, A1, P1
M0, A0, P0
486 (50 MHz) – 20 ns cycle time
=> 50% change of microkernel!
=> Microkernels are inherently non-portable