Windows 10 VM High Memory Usage Issue After PVE Restart/Reboot (with Balloon)

[cyvb]

Hi, I'm new to PVE and recently I have set up my first Windows 10 vm. But I have an issue with memory usage on the guest vm.

I'm using PVE 8.1.4 on Debian 12 with VirtIO 0.1.240. The situation is usually after a PVE fresh start or reboot, the windows guest's memory usage become very high, like 70%-80%.
And the memory usage decreases gradually, and it finally stops at a about 7-10 GiB, which is a normal usage for a fresh start Windows OS.
If I restart just the Windows vm after the memory usage become normal, it seems there would not be this abnormal usage until I restart my PVE.
I have tried installing drivers both via Guest Tools Installer and manually through Device Manager. But the situation keeps coming up.
I have 64 GiB memory on my physical machine and I set up the guest's memory to a minimum of 8 GiB and maximum of 32 GiB with Balloon.

Is this a normal situation or can I fix this?

 

[cwt]

Try to disable ballooning for the VM (set memory to 32gb). 7-10GB RAM usage (without cache usage) is not normal for W10 after startup.

 

[UdoB]

windows guest's memory usage become very high, like 70%-80%.

This should be normal behavior: not used Ram is wasted Ram! Every modern OS uses it for (invisible) caching.

Ballooning does only reclaim Ram from a guest when a there is an actual need for it, iirc when the host uses more than 80 % Ram already.

Oh, and welcome to the club