本文描述了E1000类网卡的收发包原理，详细介绍了BD环的原理，形成及使用过程。对网卡驱动开发，网卡性能优化等有直接的帮助。-This paper describes the the E1000 NIC transceiver package principle, details of the the BD ring the principle, formation and use process. Drive the development of the network card, netwo