[Openstack] Openstack+KVM+overcommit, VM priority

Ivan Derbenev ivan.derbenev at tech-corps.com
Thu Jan 12 07:16:40 UTC 2017

no, that's not my question.

I'm already overcommiting, but now need to prioritize one instance above others in terms of perfomance.

От: Eugene Nikanorov <enikanorov at mirantis.com>
Отправлено: 12 января 2017 г. 1:13:27
Кому: Ivan Derbenev; openstack at lists.openstack.org
Тема: Re: [Openstack] Openstack+KVM+overcommit, VM priority


see if it provides an answer: https://ask.openstack.org/en/question/55307/overcommitting-value-in-novaconf/


On Wed, Jan 11, 2017 at 1:55 PM, James Downs <egon at egon.cc<mailto:egon at egon.cc>> wrote:
On Wed, Jan 11, 2017 at 09:34:32PM +0000, Ivan Derbenev wrote:

> if both vms start using all 64gb memory, both of them start using swap

Don't overcommit RAM.

> So, the question is - is it possible to prioritize 1st vm above 2nd? so the second one will fail before the 1st, to leave maximum possible perfomance to the most importan one?

Do you mean CPU prioritization? There are facilities to allow one VM or
another to have CPU priority, but what, if a high priority VM wants RAM,
you want to OOM the other? That doesn't exist, AFAIK.


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