-RMR based applications. The value of *max_msg_size* will be
-used when allocating zero copy send buffers which must be
-allocated, possibly, prior to the application knowing the
-actual size of a specific message.
+RMR based applications. The *max_msg_size* parameter is used
+to allocate receive buffers and is the maximum message size
+which the application expects to receive. This value is the
+sum of **both** the maximum payload size **and** the maximum
+trace data size. This value is also used as the default
+message size when allocating message buffers. Messages
+arriving which are longer than the given maximum will be
+dropped without notification to the application. A warning is
+written to standard error for the first message which is too
+large on each connection.