2CPU tackles Hyper-Threading

2CPU—because two is better than one—delves into the technical aspects of Intel's Hyper-Threading.
Moving forward, it's important (and somewhat obvious) to note that a CPU that supports hyper-threading is not going to provide comparable performance with two physical processors rated at the same speed. The simple reason for this is because the two logical processors that make up your hyper-threaded CPU have to share resources, namely the execution engine, cache, and access to the system bus.
Bear in mind that the dual processor P4 Xeon system that they test with runs at a slower 533MHz FSB than the uniprocessor P4's 800MHz FSB. There will be a follow-up article taking a look at HT under Linux 2.6.
Tip: You can use the A/Z keys to walk threads.
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