+=item MEMCACHED_BEHAVIOR_DISTRIBUTION
+
+Using this you can enable different means of distributing values to servers.
+The default method is MEMCACHED_DISTRIBUTION_MODULA. You can enable
+consistent hashing by setting MEMCACHED_DISTRIBUTION_CONSISTENT.
+Consistent hashing delivers better distribution and allows servers to be
+added to the cluster with minimal cache losses.
+
+=item MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
+
+Memcached can cache named lookups so that DNS lookups are made only once.
+
+=item MEMCACHED_BEHAVIOR_SUPPORT_CAS
+
+Support CAS operations (this is not enabled by default at this point in the server since it imposes a slight performance penalty).
+
+=item MEMCACHED_BEHAVIOR_POLL_TIMEOUT
+
+Modify the timeout value that is used by poll(). The default value is -1. An signed int pointer must be passed to memcached_behavior_set() to change this value. For memcached_behavior_get() a signed int value will be cast and returned as the unsigned long long.
+