We have been running a FC4/PPC64 machine where we have run into the following issues with POSIX message queues. -An application fails to close/unlink queues, allowing the machine the reach the /proc/sys/fs/mqueue/queues_max limit. I don't know how to cleanup message queues let open after process dies. Note: ipcs doesn't seem to work with POSIX message queues. -The default /proc/sys/fs/mqueue/msg_max is set to 10, we would like to have this set to 100 when the machine is rebooted I've noticed POSIX message queues are relatively new to the Linux 2.6 kernel, is the support just not finished? Thanks, Daniel