Design and Implementation of Zero-Copy for Linux

Zero-Copy has been a hot research topic for a long history, which is an underlying technology to support many applications, including multimedia retrieval, data mining, efficient data transferring, and so on. Zero-Copy means during message transmission, there is no data copy among memory segments on any network node. When a message is sent out, the data packets in user application space go through network interface directly and reach outside of the network; and when receiving a message, the same way is used, meaning the data packets are transmitted into user application space directly.