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Those are memory blocks used internally by the virtualisation software - typically the Hypervisor (and they can't be freed up for use by guest domains)
I've noticed that these sys allocations are consistent for the same hardware.
T3-1 it is 502M (I have 6 of these and it is the same on all)
5220 it is 128M (I have 2 of these and it is the same on all)
Is this documented somewhere?
Edited by: 893902 on 10/05/2012 17:50
The amount of memory used is not documented anywhere as it's an implementation detail and liable to vary. You could possibly assume that the value on a platform is a lower bound but there would be no guarantees that some extra memory would not be allocated, if needed, depending on the config.
I have had confirmation from Oracle that any free memory can be allocated to guests.
Whatever free memory exists can be allocated to guests. I guess that means the hypervisor will not try to claim any additional memory.