we have a windows server 2012 enviroment with two hyper-v servers.
Each of them has two 16 Core AMD CPU's, eight 16GB DDR3 ECC RAM modules, 10 HDD's in HW-Raid 6.
Now Hyper-V is running and some VM's are up. But the VM's have a very poor CPU performance.
One VM has 24 vCPU's and 80GB RAM (as well Windows Server 2012). But if I start Prime95 in this machine the vCPU counters are all at 100% - the Host idles by 3%. Logically, the result of the prime-number-test needs ~12 times longer than the host itself.
(RAM-Speed and HDD-Speed are great)
Has anyone an idea what's wrong here?
I am grateful for every advice!
Things I have tried:
- Disable NUMA
- More priority for this VM
- Update VM integration tools
- Installed all updates
- Enable "maximum performance"-Energy setting on host and vm