Scott Drummonds on Virtualization

Hyper-Threading on vSphere


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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ESX Memory Management: Ballooning Rules


[Taken from my communities blog, this article shows you why you should “Love Your Balloon Driver”.]

Earlier this month we finally published one of my favorite papers from ongoing vSphere launch activities. This paper on ESX memory management, written by Fei Guo of performance engineering, has three graphs that are absolute gems. They show balloon driver memory savings next to throughput numbers for three common benchmarks. The conclusion is inescapable: the balloon driver reclaims memory from over-provisioned VMs with virtually no impact to performance. This is true on every workload save one: Java.
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