I have an odd situation here, so I thought I'd see if anyone else has run into it. I have a Hyper-V host (2012) that had two VM's on it, one of which was an Exchange 2013 server. The other is a 2012 file server. The Exchange server has been pegged at 100% utilization, the file server is about 50%.
As a test I built a Windows 2012R2 server and being a fresh install doing exactly nothing it had CPU utilization of 10-15%.
I have been troubleshooting with MS thinking it was something on the Exchange server causing the issue. But today I moved it (using Hyper-V move while it was running) to another (similar hardware) Hyper-V host, and the utilization has dropped to 2%.
The hardware is roughly equivalent but not exactly the same.
Best Answer
MS support was unable to isolate a cause for this condition;however, migrating all vm's off of the host, and then back fixed the utilization issue. I can only assume that it was something in the way the VM's were interfacing with the physical processors and the migration process eliminated it.