vmmem memory leak exhaust host PC virtual memory

[mhtvsSFrpHdE]

Solution: Update to Windows August version 26100.4946 or above fixed this, no memory leak anymore

Original post: mhtvsSFrpHdE/unofficial-gpu-partition-document#2
But I can't find solution, here for ask help

Windows version: Both Host and Guest 26100.2033
Nvidia driver version: 580.97, Game Ready
Graphics card: Nvidia GeForce 1080 Ti

After start sunshine streaming, when time grows and program use graphics, sunshine will randomly say something like connection slow even in LAN environment, once the hint appears, guest OS vmmem process commit size grows about 4 GB. It may appear every 10~30 minutes randomly.

Typical games

• Honkai: Star Rail, especially in Simulated Universe: Swarm Disaster, the game frequently show loading screen in this scene
• Genshin Impact, leaks less, the game doesn't often show loading screen compare to Honkai: Star Rail
• It also leaks on anything, even just open Firefox and watch some youtube videos, but not leak that fast compare to game

Leaked memory can't be measured inside guest VM.
In host VM, it reports as driver locked in sysinternals RAMmap, and commit size of vmmem process in task manager

Reboot virtual machine doesn't free commit size, only shutdown virtual machine do, I can start virtual machine again without reboot host OS

• Change to Nvidia studio driver didn't fix this
• Turn off Hardware-accelerated GPU scheduling in both guest and host feels like reduced bug happen frequency, but still exist

I also discover:
Don't have to disable Hyper-V virtual monitor to improve capture performance of virtual display driver, just raise the virtual display driver refresh rate (Hz) is OK, like target 60 FPS gaming, then set virtual display driver to 120 Hz and use RivaTuner to set a FPS limit to game, this allows OpenGL apps to run and provide decent capture performance

[mhtvsSFrpHdE]

Test and result

Gaming with Hyper-V monitor without "disable it or set to display on 2 only"

Result: With hyper-v virtual monitor enabled while gaming, slow connections will still exist, but frequency are reduced vast and leaks less

Gaming while "not connect with basic mode"

Result: No noticeable difference between connect and not connect

Restart Nvidia driver on host PC, Windows key + Ctrl + Shift + B simultaneously

Result: Screen flashed black, but nothing happens to memory commit size

memreduct did anything?

Result: No

Disable Hyper-V virtual monitor and display device at all, like how Easy-GPU-PV do

Result: Still leaks, but less frequently, same as "Gaming with Hyper-V monitor without "disable it or set to display on 2 only""

My conclusion

None of the above method can completely fix memory leak, some of them reduce leak frequency and amount

I'll leave Hyper-V virtual monitor on and raise virtual display driver refresh rate to fix capture performance, so OpenGL apps can open directly without any manually operation

Also allocate 320 GB virtual memory (page file) on host OS, can last long enough to finish the game before crash, so I can shutdown guest os to free memory manually.