The Intel Xeon processor introduces a new technology called Hyper-Threading that makes a single processor behave like two logical processors. The technology allows the processor to execute multiple threads simultaneously, which can yield significant performance improvement. But, exactly how much improvement can you expect to see?

This article at IBM developerWorks gives the results the investigation into the effects of Hyper-Threading on the Linux SMP kernel. It compares the performance of a Linux SMP kernel that was aware of Hyper-Threading to one that was not.

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