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Linux Journal: Obsolete Microkernel Dooms Mac OS X to Lag Linux in Performance

May 29, 2002, 23:30 (26 Talkback[s])
(Other stories by Miles Nordin)

"Disagreements exist about whether or not microkernels are good. It's easy to get the impression they're good because they were proposed as a refinement after monolithic kernels. Microkernels are mostly discredited now, however, because they have performance problems, and the benefits originally promised are a fantasy.

"The microkernel zealot believes that several cooperating system processes should take over the monolithic kernel's traditional jobs. These several system processes are isolated from each other with memory protection, and this is the supposed benefit.

"Monolithic kernels circumscribe the kernel's definition and implementation as 'the part of the system that would not benefit from memory protection...'"

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