关键词: 软件路由器, Click, I/O, 轮询, 零拷贝, 报文预取

Abstract: Software router has played a more and more important role in the development of modern networks, and the Click modular router has been one of the most popular software routers as it provides a good platform for new protocol development and rapid prototyping. Due to external overhead introduced by practical mechanism, I/O performance, which has become a bottleneck, strictly prevents the packet processing capability of Click in the user level. Aiming at the shortcomings of the I/O mechanism in the existing Click modular router, this paper proposes an optimized I/O framework for the Click modular router in the user level, through using the poll mode, zero copy and packet prefetching. The experimental results show that the optimized I/O framework can provide better performance (121 times) than the native.

Key words: software router, Click, I/O, poll mode, zero copy, packets prefetching