In order to continue on memory optimizations, I've been trying to use the JNA. However, when I copy the jna.jar to the lib directory? I get the warning. I'm currently running the 0.6.5 version of cassandra.

WARN [main] 2010-10-08 09:16:18,924 FBUtilities.java (line 595) Unknown mlockall error 0

Should I be worried about this warning, in case JNA might not be working?