On Tue, Aug 21, 2007 at 06:06:19PM -0700, Christoph Lameter wrote:
> Ok. Measurements vs. simple cmpxchg on a Intel(R) Pentium(R) 4 CPU 3.20GHz
Note the P4 is a extreme case in that "unusual" instructions are
quite slow (basically anything that falls out of the trace cache). Core2
tends to be much more benign and generally acts more like a K8 in latencies.
There are millions and millions of P4s around of course and we
shouldn't disregard them, but they're not the future and not
highest priority.
-Andi
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