Drawback History
When the first HT processors were released it was difficult for some users to decide whether to enable it, because many of them were still using operating systems that were not optimized for hyper-threading technology (e.g. Windows 2000 and Linux older than 2.4). Also, since most computers had previously had single-threaded processors, few programs were able to take advantage of the feature on their own.
In 2006, hyper-threading was criticised for being energy-inefficient. For example, specialist low-power CPU design company ARM has stated simultaneous multithreading (SMT) can use up to 46% more power than dual-core designs. Furthermore, they claim SMT increases cache thrashing by 42%, whereas dual core results in a 37% decrease. Intel has disputed this claim, stating that hyper-threading is highly efficient because it simply uses resources that would otherwise be idle. In 2010, ARM has stated that it will include simultaneous multithreading in its chips in the future.
Read more about this topic: Hyper-threading
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