Do you have the overt-guest-agent running on your VMs? It’s required for 
ballooning to control allocations on the guest side.

> On Jun 12, 2019, at 11:32 AM, Strahil <hunter86...@yahoo.com> wrote:
> 
> Hello All,
> 
> as a KVM user I know how usefull is the memory balloon and how you can both 
> increase - and also decrease memory live (both Linux & Windows).
> I have noticed that I cannot decrease the memory in oVirt.
> 
> Does anyone got a clue why the situation is like that ?
> 
> I was expecting that the guaranteed memory is the minimum to which the 
> balloon driver will not go bellow, but when I put my host under pressure - 
> the host just started to swap instead of reducing some of the VM memory (and 
> my VMs had plenty of free space).
> 
> It will be great if oVirt can decrease the memory (if the VM has unallocated 
> memory) when the host is under pressure and the VM cannot be relocated.
> 
> Best Regards,
> Strahil Nikolov
> 
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