You are correct that the problem is not JBoss-related. The only JVM-related parameter that I can think of that might have anything to do with this is -XX:-UseParallelGC to turn off the parallel garbage collector (given your machine, it is on by default). If that doesn't work, you might have better luck asking your question in a RedHat forum. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042005#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...