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[Xen-API] CentOS6 & Ubuntu12 PV domU Memory

Hi Everyone,

I'm not sure if I'm the only one facing it or is it a known issue.
CentOS6 and Ubuntu12.04 domU report less memory than they actually have.

Example, a CentOS6 VM with 512MB shows only 484 as total in free -m.
A Ubuntu domU shows 284M as total if the static max is 8GB and target memory is 512MB.

Both domUs are 64bit.

CentOS5 reports the exact same memory as its target.
I would be thankful if someone can share a reason or their domU # free -m


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