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Our messaging layer is used for small control messages, not large data payloads. By calling recvmsg twice for every incoming message we're hitting the socket lock reasonably hard. With senders doing the same, and a lot of messages flowing in each direction, the contention is non-trivial. This changes the receiver to copy as much of the incoming stream into a page that is then framed and copied again into individual allocated messages that can be processed concurrently. We're avoiding contention with the sender on the socket at the cost of additional copies of our small messages. Signed-off-by: Zach Brown <zab@versity.com>