Pivot Point

Scott Drummonds on Virtualization

vSphere 4.0, Hyper-Threading, and Terminal Services

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I recently wrote a blog article detailing Hyper-Threading (HT) and its effect on vSphere.  An astute reader pointed out, a recent update to Project VRC’s terminal services analysis suggests disappointment with HT on vSphere.  We spent a lot of time looking at those results to understand why they contradicted the body of performance data, which show HT offering 10-30% gain on vSphere. What we discovered led us to create a vSphere patch that would allow users to improve performance in some benchmarking environments.

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Hyper-Threading on vSphere

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I continue to receive many questions from our customers on the expected performance gains of the new version of Hyper-Threading in Intel’s Core i7 processors. The answer requires a little bit of discussion on Hyper-Threading, a little bit on ESX, and comes with some performance data. If you are still interested, read on.

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