This week at LWN: Comparing Linux and Minix
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Toward the end of his linux.conf.au talk, Andrew Tannenbaum put up a few slides on the runtime cost of the microkernel approach. He had quite a few benchmarks, but the bottom line was that the microkernel architecture used in Minix imposed a roughly 5-10% performance penalty, depending on what one is trying to do. While operating systems hackers would normally cringe at the prospect of paying a 5% penalty, to many people this could seem like a good deal: give up 5-10% of a processor which is mostly idle anyway in exchange for a more reliable system.
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