Hyper-V Core Parking performance issues


  • Over the past few months I have been seeing performance issues with Windows 2003 virtual machines running on a Windows Server 2008 R2 (with and without SP2).
    Every now and then when the Windows 2003 machine with 2 virtual processors is under load, it will slow to a crawl.

    Looking at the resource monitor on the Hyper-V host reveals 3 out of 4 cores are set to "park". Running some programs on the host in an attempt to "wake" them doesn't appear to have any effect. I then set the power profile in the control panel to High Performance and the cores magically awake though I am not sure if this fixes things permanently or not.

    As far as I can tell this appears isolated to the Xeon E5xxx series of processors. I am running some SuperMicro E550x servers and some custom built ones with the same issue.

    Is Microsoft aware of this issue and is there some sort of patch to resolve this a bit more permanently then the workaround above?



    Friday, April 15, 2011 4:08 PM

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