My Hyper-V VM(Server2008R2, SP1) shows very high (almost 100%) CPU use when fully under heavy load (6cores from total physical 8cores, 25Gb RAM from total 32GB) - used as TS, Picture TOP right corner

VM2 (SQL machine, Server 2008R2, SP1) shows almost no CPU use (1 core, 4GB RAM) - picture TOP LEFT

And funny thing :Physical machine (Bottom picture) has only 1core dedicated out of 8cores + 4GB dedicated out of 32GB just enough to run primary OS and hypervisor) -This physical machine shows almost no load !! for ALL cores of both quad-core CPUs! - Picture on bottom.

Problem/Question : 1, Are my CPUs working on 100%, but it doesnt show the Load which is in VMs? (so here the CPU graph is not correct in terms of "physical machine total CPU use") - or 2, The CPU graph in Physical machine is correct, and all the Cores are beeing bored and not used for even 10% in the physical machine.(Rooftop of virtualization??)

  • or....??

Does anybody has experience with such a performance issue/performance evaluating of Hyper-V VMs vs physical machine? I just want to know, if all my CPU power is beeing used as it shows in VM...If so I have to get new hardware, if not : My hardware should be fine, only some tweeking might be needed....or?

Picture attached : https://plus.google.com/photos/58146/albums/433/770?banner=pwa&pid=770&oid=58146

LEFT : VM SQL load (not important) RIGHT : Application VM 100% load!!!!! BOTTOM : Physical machine load showing tiny CPU use

  • What is the host CPU config, and how many vCPUS have you assigned to the guest? It's not a 1-to-1 comparison when assigning vCPU against host physical hardware.
    – DanBig
    Oct 23, 2014 at 17:44
  • You image link seems to be broken. Can you please re-upload that on imgur.com?
    – Zoredache
    Oct 23, 2014 at 18:47
  • HI, probably redirected URL, here valid one : picasaweb.google.com/lh/photo/…
    – Jozef
    Oct 23, 2014 at 20:03
  • CONFIG : Physical machine Dell poweredge 2950 : 2x CPU Xeon 3ghz quadcore, 32Gb RAM, RAID10 4xSAS 15K + 2xSSD for OS and MSSQL. Application Virtual machine : assigned from total : 6 cores, 25GB, RAID for data, 1xSAS for OS MSSQL machine : assigned :1 core, 4Gb RAM.
    – Jozef
    Oct 23, 2014 at 20:07
  • @Jozef: Did you manage to solve this? (Also Image-Links are dead.) Dec 9, 2015 at 11:59

1 Answer 1


try this tool to show the real CPU usage of guests:

enter image description here


  • Hi, thank you, I will give it a try. great!!! Do you think running this tool on host and guest will show correct-the same results ?
    – Jozef
    Oct 23, 2014 at 20:10
  • try it on the host and look if the CPU usage is now displayed correctly. Oct 24, 2014 at 4:15
  • HI, seems my OS is not supported... :-( SERVER 2008R2, SP1
    – Jozef
    Oct 24, 2014 at 6:02
  • maybe it only works with Server 2012. Oct 24, 2014 at 17:14
  • hi, I see that, but both my OS (guest and host) are Server 2008R2, any tools for this?
    – Jozef
    Oct 25, 2014 at 20:25

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