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+===========
+ Messaging
+===========
+
+General Settings
+================
+
+``ms tcp nodelay``
+
+:Description: Disables nagle's algorithm on messenger tcp sessions.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``ms initial backoff``
+
+:Description: The initial time to wait before reconnecting on a fault.
+:Type: Double
+:Required: No
+:Default: ``.2``
+
+
+``ms max backoff``
+
+:Description: The maximum time to wait before reconnecting on a fault.
+:Type: Double
+:Required: No
+:Default: ``15.0``
+
+
+``ms nocrc``
+
+:Description: Disables crc on network messages.  May increase performance if cpu limited.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``ms die on bad msg``
+
+:Description: Debug option; do not configure.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``ms dispatch throttle bytes``
+
+:Description: Throttles total size of messages waiting to be dispatched.
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``100 << 20``
+
+
+``ms bind ipv6``
+
+:Description: Enable if you want your daemons to bind to IPv6 address instead of IPv4 ones. (Not required if you specify a daemon or cluster IP.)
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``ms rwthread stack bytes``
+
+:Description: Debug option for stack size; do not configure.
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``1024 << 10``
+
+
+``ms tcp read timeout``
+
+:Description: Controls how long (in seconds) the messenger will wait before closing an idle connection.
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``900``
+
+
+``ms inject socket failures``
+
+:Description: Debug option; do not configure.
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``0``
+
+Async messenger options
+=======================
+
+
+``ms async transport type``
+
+:Description: Transport type used by Async Messenger. Can be ``posix``, ``dpdk``
+              or ``rdma``. Posix uses standard TCP/IP networking and is default. 
+              Other transports may be experimental and support may be limited.
+:Type: String
+:Required: No
+:Default: ``posix``
+
+
+``ms async op threads``
+
+:Description: Initial number of worker threads used by each Async Messenger instance.
+              Should be at least equal to highest number of replicas, but you can
+              decrease it if you are low on CPU core count and/or you host a lot of
+              OSDs on single server.
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``3``
+
+
+``ms async max op threads``
+
+:Description: Maximum number of worker threads used by each Async Messenger instance. 
+              Set to lower values when your machine has limited CPU count, and increase 
+              when your CPUs are underutilized (i. e. one or more of CPUs are
+              constantly on 100% load during I/O operations).
+:Type: 64-bit Unsigned Integer
+:Required: No
+:Default: ``5``
+
+
+``ms async set affinity``
+
+:Description: Set to true to bind Async Messenger workers to particular CPU cores. 
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``ms async affinity cores``
+
+:Description: When ``ms async set affinity`` is true, this string specifies how Async
+              Messenger workers are bound to CPU cores. For example, "0,2" will bind
+              workers #1 and #2 to CPU cores #0 and #2, respectively.
+              NOTE: when manually setting affinity, make sure to not assign workers to
+              processors that are virtual CPUs created as an effect of Hyperthreading
+              or similar technology, because they are slower than regular CPU cores.
+:Type: String
+:Required: No
+:Default: ``(empty)``
+
+
+``ms async send inline``
+
+:Description: Send messages directly from the thread that generated them instead of
+              queuing and sending from Async Messenger thread. This option is known
+              to decrease performance on systems with a lot of CPU cores, so it's
+              disabled by default.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+