Hi,

iirc the guest agent is not needed anymore as we get almost the same
stats from the balloon driver directly.

Ballooning has to be enabled on cluster level though. So that is one
thing to check. If that is fine then I guess a more detailed
description is needed.

oVirt generally starts ballooning when the memory load gets over 80%
of available memory.

The host agent that handles ballooning is called mom and the logs are
located in /var/log/vdsm/mom* iirc. It might be a good idea to check
whether the virtual machines were declared ready (meaning all data
sources we collect provided data).

--
Martin Sivak
used to be maintainer of mom

On Thu, Jun 13, 2019 at 12:26 AM 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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