applying a modified version of that patch attached to https://issues.apache.org/activemq/browse/AMQ-1689 - This reduces the the number of disk syncs that the broker does on some workloads which increases performance - Fixed and issue where the last write to disk migh get lost on broker shutdown.
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/kaha/impl/async/DataFileAppender.java