Andrea Arcangeli's latest patches include a spinlock-measuring option, if
anyone wants to measure this now. It's at
ftp://e-mind.com/pub/andrea/kernel/ and includes a bunch of other stuff,
so use with care (Andrea, can you please separate out the spinlock
profiling patch?).
I know some people think it's only good up to 2, and others think it's
fine up to 4, and few think it's any good beyond that, but does anybody
have any measured comparisons, with actual numbers? I don't have any
quad-CPU machines around to test. I realize the overhead depends on the
application, but I don't even have a general idea of what to expect.
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