"ALRubinger" wrote : Do you feel this is more in part due to the ThreadLocal implementation of the pool, or the fact that it's unbounded (==we spread things too thin)? | | S, | ALR Actually, I think its because of the ThreadLocal implementation. For example, in one of the cases where we switched the configuration to use the StrictMaxPool, I had to set it to 6 million to get rid of the timeouts, and throughput still went up. In the other case, the configuration was only 100 (on both ThreadLocalPool and StrictMaxPool), and throughput increase by 300 transactions per second. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4256276#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...