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MSR to control h/w prefetchers disclosed

We just publicly disclosed how to enable/disable h/w prefetchers on Intel processors code named Nehalem, Westmere, SandyBridge, Ivybridge and Haswell.

Please refer to https://software.intel.com/en-us/articles/disclosure-of-hw-prefetcher-control-on-some-intel-processo... for more details.

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