Open Stack

Hi,

In our cloud we use 1G huge pages for the instance memory. 
We started notice that qemu has a relevant memory overhead 
per domain (something like 300MB per domain). As we use
huge pages for the instance memory nova scheduler makes
placement decision based on the available huge pages.
However in this situation the available host OS memory also
needs to be considered. Reserving host OS memory deployment
time is not practical as the needed reservation depends on the
number of instances that will be run on that host. 

Is there any plan in the nova community to use qemu
memory overhead in the placement decision in case of huge page
backed instance?

If there is no plan, do you support the idea adding such feature to nova?

Cheers,
gibi