More Information about Dynamic Memory in Microsoft Hyper-V

Microsoft recently announced that a new feature would be introduced with Hyper-V called Dynamic Memory. Jeff Woolsey wrote a pretty in depth article series on just about everything you want to know about this feature. The latest in this article series talks about memory overcommit, page sharing, large pages, OS memory utilization, SuperFetch, and more. Jeff states:

“…support for Large Memory Pages is a no brainer. In fact, when designing Hyper-V Dynamic Memory, we were sure to optimize in the case where Large Memory Pages are present because we expect it will soon be standard. We are so confident in Large Memory Page support that:

  • Windows Server 2008/2008 R2 have Large Memory Pages enabled by default
  • Windows Vista/7 have Large Memory Pages enabled by default
  • Windows Server 2008 R2 Hyper-V added support for Large Memory Pages (surprise!) and is one of many new performance improvements in R2

Memory page size is evolutionary. You can expect memory page size to grow beyond 2MB to even larger page sizes in the future. In fact, newer AMD64 processors can use 1GB pages in long mode and Intel is adding 1GB memory page support in their upcoming Westmere processors. (BTW, that’s not a typo, 1GB pages…)

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