[ovirt-users] what does memory balloon optimize means in cluster?

[Martin Sivak]

Hi,

Memory ballooning is a technique that allows taking memory from one
running VM when the VM is not actively using it and "returning" it
when the VM needs it.

oVirt uses it when:
- ballooning it is enabled in cluster
- memory overcommit is enabled for cluster
- ballooning device is present in VM (it is by default)
- host's memory load gets above 80%

We are deliberately pretty slow in changing the available memory so it
works best for VMs where the memory consumption does not show sudden
jumps.

As a summary: Memory ballooning is a technique that allows memory
overcommiting a host (overselling if you want).

I did a presentation couple of years back about it:
https://www.youtube.com/watch?v=PRYo1uOniFo

Best regards

--
Martin Sivak
SLA / oVirt

On Wed, Oct 11, 2017 at 3:13 PM, pengyixiang <yxpengi386 at 163.com> wrote:
> hello, every!
>     I want know what does memory balloon optimize means? and what should i
> do to test it's effective?
>
>
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