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JDK 6u25 and 6u26 high memory usage

Question asked by ebogaard on Aug 1, 2011
Latest reply on Aug 3, 2011 by ebogaard
I've been running 3.4d for quite some time on Centos5.6 and JDK 6u23. Because 6u25 and 6u26 promise higher performance, I tried to upgrade to one of these versions.
Strangely, the memory usage skyrockets with both these JDK's. From ~700 MB to > 1GB. Ofcourse with the same configuration:

-server -Xss512k -Xms600m -Xmx600m -XX:MaxPermSize=512m -XX:NewSize=300m -XX:ReservedCodeCacheSize=64m -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:CMSInitiatingOccupancyFraction=80

I tried this on x86 and x64 version of Centos + matching JDK. If I return to 6u23, everything is normal again.
Anyone any suggestions why this happens and if something cane be done against it?