[Openstack] Openstack+KVM+overcommit, VM priority

Ivan Derbenev ivan.derbenev at tech-corps.com
Thu Jan 12 12:33:58 UTC 2017

What are the facilities for cpu? That's the initial question - how can I do it if this is possible

Best Regards
Tech-corps IT Engineer
Ivan Derbenev
Phone: +79633431774

-----Original Message-----
From: James Downs [mailto:egon at egon.cc] 
Sent: Thursday, January 12, 2017 12:56 AM
To: Ivan Derbenev <ivan.derbenev at tech-corps.com>
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] Openstack+KVM+overcommit, VM priority

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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