Martin Cracauer wrote:


I tried to model different worklods.  The parallel part of my
benchmark suite has CPU-heavy processes, short plain http, php, long
plain http and mixtures thereof.

None of these showed the SMP kernel to be an overall disadvantage on a
one-processor system.

What you want is to find a real-world workload that exercises a lot of mutexes. These exist, and they'll see the most pessimization from running SMP kernel on UP.

Kris

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