Memory usage shown in RHEV Administration Portal for a VM does not reflect memory usage of that VM as shown by the OS.

Issue

• RHEV Administration Portal is showing 23% of memory usage for a given VM. Inside the VM, the OS is showing different memory usage:

# free -m
             total       used       free     shared    buffers     cached
Mem:           490        443         47          0         22        323
-/+ buffers/cache:         97        392
Swap:          991         10        981

• As per result above, used memory corresponds to 19%, considering calculations below:

used * 100 / total
97 * 100 / 490 = 19,79