I stumbled across this somehow today (don't remember where from unfortunately... I opened it in the background while reading another page and by the time I saw it, I forgot where it came from).
http://www.gotw.ca/publications/concurrency-ddj.htm
He does a good job (I think) of explaining the problems of why hyperthreading, et al don't help as much as you might think they should (or as much as I think they should).
FWIW
TjL
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