+=item MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK
+
+Set this value to tune the number of messages that may be sent before
+libmemcached should start to automatically drain the input queue. Setting
+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_IO_BYTES_WATERMARK
+
+Set this value to tune the number of bytes that may be sent before
+libmemcached should start to automatically drain the input queue (need
+at least 10 IO requests sent without reading the input buffer). Setting
+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_IO_KEY_PREFETCH
+
+The binary protocol works a bit different than the textual protocol in
+that a multiget is implemented as a pipe of single get-operations which
+are sent to the server in a chunk. If you are using large multigets from
+your application, you may improve the latency of the gets by setting
+this value so you send out the first chunk of requests when you hit the
+specified limit. It allows the servers to start processing the requests
+to send the data back while the rest of the requests are created and
+sent to the server.
+
+=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).
+
+=item MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
+
+If you just want "a poor mans HA", you may specify the numbers of
+replicas libmemcached should store of each item (on different servers).
+This replication does not dedicate certain memcached servers to store the
+replicas in, but instead it will store the replicas together with all of the
+other objects (on the 'n' next servers specified in your server list).
+
+=item MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ
+
+Allows randomizing the replica reads starting point. Normally the read is
+done from primary server and in case of miss the read is done from primary
++ 1, then primary + 2 all the way to 'n' replicas. If this option is set
+on the starting point of the replica reads is randomized between the servers.
+This allows distributing read load to multiple servers with the expense of
+more write traffic.
+
+=item MEMCACHED_BEHAVIOR_CORK
+
+Enable TCP_CORK behavior. This is only available as an option Linux.
+MEMCACHED_NO_SERVERS is returned if no servers are available to test with.
+MEMCACHED_NOT_SUPPORTED is returned if we were not able to determine
+if support was available. All other responses then MEMCACHED_SUCCESS
+report an error of some sort. This behavior also enables
+MEMCACHED_BEHAVIOR_TCP_NODELAY when set.
+
+=item MEMCACHED_BEHAVIOR_KEEPALIVE
+
+Enable TCP_KEEPALIVE behavior.
+
+=item MEMCACHED_BEHAVIOR_KEEPALIVE_IDLE
+
+Specify time, in seconds, to mark a connection as idle. This is only available as an option Linux.
+
+=item MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE
+
+Find the current size of SO_SNDBUF. A value of 0 means either an error
+occured or no hosts were available. It is safe to assume system default
+if this occurs. If an error occurs you can checked the last cached errno statement to find the specific error.
+
+=item MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE
+
+Find the current size of SO_RCVBUF. A value of 0 means either an error
+occured or no hosts were available. It is safe to assume system default
+if this occurs. If an error occurs you can checked the last cached errno statement to find the specific error.
+
+=item MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
+
+This number of times a host can have an error before it is disabled.
+
+=item MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS
+
+If enabled any hosts which have been flagged as disabled will be removed
+from the list of servers in the memcached_st structure. This must be used
+in combination with MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT.
+
+=item MEMCACHED_BEHAVIOR_RETRY_TIMEOUT
+
+When enabled a host which is problematic will only be checked for usage
+based on the amount of time set by this behavior.
+
+=item MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY
+
+When enabled the prefix key will be added to the key when determining
+server by hash.
+