Memory not increasing dynamically in Hyper-V with Windows 10 guest.

Question

I have Windows 11 host and Windows 10 guest. I have enabled dynamic memory, however, memory status switches from OK to Low and then Warning with Memory Demand visibly high as well, but assigned memory never increases. Host has ample free memory and manually I have assigned 4096 and 8192 which works ok.

I tried Windows 11 dev image and dynamic memory works ok with that.

*** Moved from Windows / Windows 11 / Performance and system failures ***

Answer 1

Hi,

Does this problem only occur on this one virtual machine? Do you see any errors in the Hyper-V logs in the Event Viewer? Please open services.msc and restart the Virtual Machine Management Service (VMMS) manually. Update the guest Windows 10 to the latest. Also try creating a VM with the same configuration and see if the issue persists on it.

Answer 2

No errors in Event Viewer.

I setup Ubuntu 22 using provided image downloads, a new Windows 10 instance using quick create and a Windows 10 instance using manual configuration. All had dynamic memory working.

I had imported this virtual disk and setup the VM around it, and I thought that may have been the issue, so I deleted the VM and created a new one, attached VHDX file to it and now dynamic memory is working ok.

I require Nested Virtualization, and soon as I enabled that using this command, Set-VMProcessor -VMName <VMName> -ExposeVirtualizationExtensions $true dynamic memory is not working anymore. Setting this to false fixes DynamicMemory

Answer 3

Same for me.

*ExposeVirtualizationExtensions* did break it