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Mach lack for frequent operations

From: Matheus Morais
Subject: Mach lack for frequent operations
Date: Fri, 18 Nov 2005 17:34:12 -0200

Quoted from Microkernels, Ăšlfar Erlingsson and Athanasios Kyparlis
"For some frequent operations, e.g. networking, the overhead of context-switching was too great for an out-of-kernel implementation. Thus the microkernels were not as efficient as originally thought."

I can't understand why for some frequent operations microkernels are not efficient as originally thought. I thinking is why IPC cost on Mach is very high. Its that true? Can anyone explain why that overhead happen in Mach?


Matheus Morais

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