ClientMessage::setFlowControlSize is only being called for large messages. So for normal messages it's always zero, meaning no credits are sent to the server............. ouch ouch | | not good | | The default value for flowControlSize is getEncodingSize() which is what it used to be. I'm using the headerSize because on regular messages you are using Message.getEncodeSize() and not Packet.getSize(). I had actually it implemented at packetSize at some point, but I changed it to byteBuffer.length when I saw that. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4195610#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...