This script comes with no waranty written or implied. Use at your own risk.
For more information on Zimbra performance tuning Guidelines, see this wiki: http://wiki.zimbra.com/wiki/Performance_Tuning_Guidelines_for_Large_Deployments#Memory_Allocation
It's provided without a license. Feel free to use and distribute. An attribution would be nice, but hey, it's not like I'm going to actually be looking or checking.
This is unofficial and has no relation to nor is it endorsed by Zimbra.