2011/1/19 Justin Clift <jclift@redhat.com>:
This completes the man page updates required for BZ # 622534:
-Change the maximum memory allocation limit in the guest domain. This should -not change the current memory use. The memory limit is specified in -kilobytes. +Change the maximum memory allocation limit for an active guest domain. + +Some hypervisors require a larger granularity than kilobytes, and requests +that are not an even multiple will either be rounded down or rejected. For +example, vSphere/ESX rejects the parameter unless the kB argument is evenly +divisible by 1024 (that is, the kB argument happens to represent megabytes).
Actually vSphere/ESX truncates in this case. It rejects in other cases (virsh define). As Dan suggested, I might change this to round up. Matthias