this value to high, may cause libmemcached to deadlock (trying to send
data, but the send will block because the input buffer in the kernel is full).
+=item MEMCACHED_BEHAVIOR_NOREPLY
+
+Set this value to specify that you really don't care about the result
+from your storage commands (set, add, replace, append, prepend).
+
=back
=head1 RETURN