基于网络处理器IXP2400的组播包高速转发技术

High-speed Multicast Packet Forwarding Technology Based on Network Processor IXP2400

传统的IP报文的组播技术,由于在处理过程中需要把整个报文的内容报文复制多份,因此处理器需要对缓存报文的外部存储空间进行多次I/O操作,这严重制约了当前处理器,特别是网络处理器的高速报文处理能力,转发效率不高。为此,提出了一种新的技术——"零拷贝"转发技术。该技术只修改报文头,报文体不复制,减少了大量的I/O操作,提高了转发效率。

Traditional IP datagram multicast technology has restrained the data processing ability of the processor（ especially network processor（NP） ） ,the forwarding efficiency is not high, because it needs to copy lots of data of the datagram many times and results in a large amount of I/O operations to the buffer memory. This paper proposes a new technology caued ＂Zero Copy＂ forwarding technology. The technology only perfects data - head, the data - body is not copied, and I/O operation is reduced, so the forwarding efficiency is improved.