Could somebody suggest an optimal JVM setting?

I am using jdk1.6u1, fedora fc5 and resin 3.0. Here is my setting:

args="-J-server -XX:NewSize=128m -XX:MaxNewSize=128m -XX:MaxPermSize=512m -J-verbosegc -XX:SurvivorRatio=5 -Xmn1500m -Xss128k -Xms2000m -Xmx2000m -XX:ParallelGCThreads=20 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:SurvivorRatio=8

-XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31"

I read other messages in the forum saying that 32 bit jvm could not grab memory > 2GB. Is that true?

[485 byte] By [christopher_chenga] at [2007-11-27 7:55:30]