Hum… Make sure mom is running on the host then, you should see it using CPU if it’s doing it’s job, maybe ksmd if you have same page merging enabled.. Note that you will see swap happen on the host still, stuff is going to get pushed out of memory even if it ballooning is happening. You should also see the guest agent using more memory on the VMs, you won’t actually see their memory available change, just the agent having a larger locked allocation.

On Jun 13, 2019, at 12:05 AM, Strahil <hunter86_bg@yahoo.com> wrote:

Hi Darrell,

Yes , all VMs (both openSUSE and RedHat/CentOS 7) have the ovirt-guest-agent up and running.

Best Regards,
Strahil Nikolov

On Jun 12, 2019 22:07, Darrell Budic <budic@onholyground.com> wrote:
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_bg@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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