Open Stack

Thiago,

Although nova is not explicitly aware of KSM, it is aware that deployers
want to over commit their memory and cpu. Check out:
http://docs.openstack.org/trunk/openstack-ops/content/compute_nodes.htmlthere's
a section on overcommiting.

-MIke


On Mon, Nov 4, 2013 at 3:35 PM, Martinx - ジェームズ
<thiagocmartinsc at gmail.com>wrote:

> Stackers!
>
> I'm thinking about something here... Linux have a very useful resource,
> called KSM (Kernel SamePage Merging), which reduces (apparently a lot), the
> amount of RAM memory used by KVM Virtual machines "of the same kind".
>
> This means that equal virtual machines "shares" portions of physical RAM
> memory using CoW technique (right?).
>
> So, I think that would be cool for OpenStack scheduler (?), to "have Linux
> KSM in mind" when launching a Instance, to try to get more from it, opening
> a window to safely increase RAM overcommit allocation ratio.
>
> What do you guys think?!
>
> Best!
> Thiago
>
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