Performance loss VM vs. Bare Metal

[typewriter]

I have a Gigabyte X99 Board with a Xeon 2699 v3 and 128 GB Ram

 

For testing purposes I installed WIndows 10 on a 500 GB SSD Sata drive from Samsung.

 

I also installed UNRAID (6.11.5) and with a 2 TB NVME Samsung SSD (installed in a 2x Port = 800 MB/S max.) and installed a VM with Windows 10 with 64 GB RAM - all 18 (36) cores are used as with the bare metal install.

 

Geekbench 3 perfomance:

 

Bare Metal:

 

Single Core: 3.487

Multi Core: 45.575

 

VM:

 

Single Core: 2.973

Multi Core: 39.148

 

In total I am losing around 15% CPU performance by using a VM. Surprisingly there is barely a difference in passing the VM trough to the CPU or using the CPU emulation.

 

Is this in general the amount of performance loss that goes with using a VM in UNRAID?

For many applications the loss may be unimportant. 

I wanted to build a audio workstation as VM to be able to update my hardware easier in the future. For this purpose 15% is a bit high. Should be similar for a gaming machine.

 

Or is there hardware that is better suited for VMs?

 

 

 

Edited November 30, 2022 by typewriter