Dynamic Memory Usage about windows

[kroese]

In the QEMU config I added the "balloon" PCI device, and the VirtIO balloon drivers should be automaticly installed during Windows installation, but maybe I forgot some step or setting to make it work (never really tested it).

Do you see the balloon device in device manager?

[raddacle]

The VirtIO Balloon driver is there, so I'm not sure what the issue is. I was hoping that running Windows in docker would be lighter as opposed to VM.

[kroese]

I did a quick investigation, and it seems like QEMU does not support automatic/dynamic ballooning by default.

There are some projects like Proxmox and Libvirt that are build on top of QEMU, and they add this logic themselves by sending balloon commands via QEMU monitor, to implement that feature.

But even if I was willing to implement the same algorithms as they do, I still doubt if it could even work. Because from inside a Docker container there is only limited information available about the memory of the host, so maybe it is not even possible to calculate things like memory pressure in the same way as these other projects can.

So I am afraid there is no easy way to fix this, unless someone with more QEMU knowledge than us decides to help us.