@dinhngtu Hi everyone,

Thank you all so much for your help and suggestions. After several tests, I’ve decided to stop troubleshooting and stick with Windows 10 in BIOS mode. UEFI doesn’t work properly for me, whether with Windows 10 or 11, but everything runs fine in BIOS mode.

I really appreciate the time and support from this great community!

@DevilDan it boot after re-enabled secure boot, i set 2 cpu not 4 like before

@DevilDan

I roll back action, freeze always, I set 2 CPU (not 4) and now i have blue screen :

@dinhngtu I try process, it freeze now at every boot :

@DevilDan I see, we have to disable secure boot, but it is mandatory for Win 11 NO ?

@dinhngtu You're right, in the first freezes, the CPU would drop to 0%. Now, in recent cases, one freeze spikes the CPU to 100% and then it drops, while another stays at 100%...

The VM still responds to ping for a while, but it eventually stops sometimes hours later. The console screen remains frozen on the Windows lock screen.

I'll look into your procedure and see if I can try it.

@dinhngtu I had freeze on Win 10 UEFI mode, not in BIOS mode, I have only this example 24H2 UEFI Bug, 23H2 UEFI Bug, Win 10 Uefi Bug, Windows 10 BIOS OK

@DevilDan

Console is... Frozen again..... I Think it's UEFI problem, Win 10 BIOS MODE no problem....

@DevilDan No bugs for the moment, PS : I choose the "other-media-install" template with all VM, maybe the static min memory is impacted finally ?

EDIT : 20 MARCH 2025 20H45 : always NO PROBLEM

@cirosantos0

Thanks! I changed this parameter yesterday, and everything is set to the exact same value down to the byte.

No bugs so far, but I did notice some CPU usage differences between Windows 10, Windows 11 23H2, and Windows 11 24H2. Only Windows 11 24H2 constantly consumes more CPU, staying between 6-10%, while the other versions peak between 0-3%. 24H2 is really bad...

That being said, the freezes don’t seem related to this. Let’s see if changing the static min RAM makes a difference. Would be great if it does! We’ll adjust accordingly.

@cirosantos0 @Danp @dinhngtu

Thanks for your feedback!

I usually always set the Dynamic and Static memory limits to the same value because I don't like auto-scaling based on load. I prefer to allocate the actual possible usage. I've attached a screenshot of my RAM configuration; since I'm not very familiar with Xen Orchestra, I just want to confirm that this setup is correct. Normally, I've set both the minimum and maximum dynamic memory to 8GB, as well as the static memory.

So far, my Windows 10 VM (BIOS) hasn’t had any issues, but the Windows 11 VM (UEFI) still seems to freeze. I’ll double-check, but it looks like the problem is really related to UEFI.

Also, I can't edit the static min memory value in XOA, and I don't know why. Is this the expected behavior?

Just to be sure, I'll set the static min memory to 8GB (in CLI on XCP-NG console) and observe the behavior, even though the documentation suggests it shouldn't make any difference.

@dinhngtu
I also remember having installation issues and freezes with PFsense VMs or performance slowdowns with OPNSense in UEFI mode, I think. It feels like UEFI isn't that great?

@dinhngtu

No issues on Linux VMs, the problem only occurs on Windows 11 24H2, 23H2 (so far) and Windows 10, all running in UEFI mode.

• No issues so far on a new Windows 10 VM running in BIOS mode.
• I'm always installing Xen Guest drivers 9.4 (we also tested without them).
• The VMs have nothing special installed, it's just a clean Windows setup.
• I don't remember if the issue appeared on both Windows versions at the same time, so I can't confirm a correlation, but it's a possibility.
• I had some "coalesce" issues on another Linux VM, but that's been resolved, and it doesn't seem related.
• I already tested both Intel and Realtek NIC models, same issue. However, I'll switch everything back to Realtek just in case.
• Currently, I have a Windows 11 24H2 VM and a Windows 10 VM (I deleted Windows 11 23H2—it was the most stable and used less CPU than 24H2, but since I'm testing, I'll stick with 24H2).

@Danp @dinhngtu Hi, today I will try Win 10 22H2 latest. Maybe it is the vtpm and uefi secure boot the problem ? I have a freeze at boot on DVD when asking Product Key, i restart install, with VTPM and UEFI + secure boot, loike Win 11, we will see

Edit : CPU instable, after freeze, I try in BIOS mode with no VTPM

@dinhngtu It's not the software, the problem is back again

@Danp @dinhngtu I haven't encountered the problem for 3 days, following a modification I made, I don't know if it's this modification that solved the problem (a little software I was installing on the VM, and that I uninstalled).

@Danp hi thanks, i don't think i use all on default param on xoa and xcp-ng

@dinhngtu The problem is back, I will check if i do something bad, i don't understand... Unlucky

@mickwilli yes sorry, i post a new subject and the update february fix lot of bugs, but not the freeze, but i found the solution now, i installed a new vm with W11 PRO 23H2, no bugs it's fine thanks to all, all bugs fixed in previous version 23H2, it's Microsoft, the past Is better than the future

@dinhngtu

Yes thanks.... I Will avoid this ******* version

If there is march or April updates, i will test and check if its better