Nested Virtualization is not a new idea. In fact, we announced our first preview of Nested Virtualization running on Windows way back in 2015. From that Windows Insider preview to now, Nested...
Updated Jun 13, 2020
Version 2.0
Blog Post
Oh okay... i get it now. I will check my VM performance and get back. For some reason, i read this as the host having issues.
Edit...
i ran some tests... i did see a slight hit in the benchmark tests. I did tests at 3 different phases. Ran multiple times and took the average
1.) Vanilla VM without running the command -ExposeVirtualizationExtensions on the VM
2.) After exposing the extensions but not installing the Hyper-V role
3.) With extensions enabled and Hyper-V role installed.
Here are the specs for my VM:
2 Virual Processors (from Ryzen 3900X)
4096 MB Memory (dynamic enabled but not using more than 4096)
VM installed to a SATA SSD seperate from OS drive
Here are my bench numbers for single and multi-core. My total performance dropped about 20 points from vanilla which is about a 5% total loss in score but there was also a hit in performance, although minor just from enabling the virtualization extensions:
No Nesting enabled
520.5
1009.8
Nesting without Hyper V installed
513.8
1002.5
Nesting Enabled & Hyper V installed
502.8 - single
989.4 - multi
I did not run any tests in my host
For my usecases of this, this is usable for me and i am just glad to be able to do nesting without having to use VMWare Workstation now on my homelab and development environment...
I am not sure if it is your hardware causing the larger degredations or not or if it is something to do with the install and maybe a reinstall of windows 11 would fix it? I am not sure. I did read on their windows 11 blogs that if folks have issues or error to uninstall windows 11 and reinstall it again. Not sure if that would fix it for you or not.
Here's to hoping that any performance issues will be addressed in patches.