does ballooning really reduces mem usage in proxmox?

[encore]

Hi,

i configured ballooning for our Windows KVM machines and it seems to work:
http://prntscr.com/n03mej

When I sum all KVM machines "Memory usage" I will get something like 40 gb memory usage (18 KVM machines).
Furthermore there are 15 LXC container on that node (memory usage something like 6 gb).

But proxmox and free -m telling me "160 gb used":
http://prntscr.com/n03nno
http://prntscr.com/n03p75

Also Htop shows the amount of total memory instead of used memory:
http://prntscr.com/n03nwj
12,7% of 256 gb memory are 32,512 gb memory. This VM has 32 gb memory:
http://prntscr.com/n03okd
but ballooning seems to work, proxmox says only 1,2 GB memory used.

Any ideas?

 

[encore]

mb, https://pve.proxmox.com/wiki/Dynamic_Memory_Management
can confirm it "started" at > 80% mem usage.