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There's not really any need for 10% in my experience. Giving dom0/bare 
metal around 3-4GB is perfectly fine for the vast majority of scenarios, 
even when there's a hundred or more VMs on the box. Most compute node 
server hardware nowadays should have 128-512GB of RAM available, and 4GB 
for the host is more than enough.

-jay

On 09/04/2014 12:45 PM, Juan José Pavlik Salles wrote:
> Hi Tomasz, thanks for your answer. I'll start with 10% and see what
> happens. Thanks again!
>
>
> 2014-09-04 13:37 GMT-03:00 Tomasz Napierala <tnapierala at mirantis.com
> <mailto:tnapierala at mirantis.com>>:
>
>
>     On 04 Sep 2014, at 18:04, Juan José Pavlik Salles
>     <jjpavlik at gmail.com <mailto:jjpavlik at gmail.com>> wrote:
>
>      > Hi guys, I'm running a Grizzly cloud with Ubuntu 12.04+KVM. I'd
>     like to know if there's any kind of recommended free RAM for the
>     Hypervisor. I know there's a nova variable called "
>      > reserved_host_memory_mb" but don't know what a proper value would be.
>
>     Check on deployed compute node that has no running VMs, add some
>     margin, say 10% and you should be fine. Usually compute nodes are
>     not consuming extra memory besides VMs.
>
>     Regards,
>     --
>     Tomasz 'Zen' Napierala
>     Sr. OpenStack Engineer
>     tnapierala at mirantis.com <mailto:tnapierala at mirantis.com>
>
>
>
>
>
>
>
>
>
> --
> Pavlik Salles Juan José
> Blog - http://viviendolared.blogspot.com
>
>
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