Augmenting general purpose processors for network processing
Hamid Reza Ghasemi, Hossein Mohammadi, Behnam Robatmili, N. Yazdani · 2004
Growth of network line speeds and needs for new services in routers have led to the emergence of new generation of fast and scalable devices for packet processing. A special purpose processor designed for networking, called Network Processor or NP, performs special network processing tasks internally. Network processors must be flexible since the protocols and technology in the field change rapidly. This requires programmability while complicates the design process. Network processors are supposed to work in a speed close to ASIC and with programmability like GPPs. One approach in implementing network processors is augmenting general purpose architectures or instruction sets for network processing. In this paper, we introduce some special instructions and methods for improving general processors to work in network environment. These instructions are designed after studying different processing required in IP networks. We present experimental results to show the improvement achieved by adding these instructions to a modeled GPP. We also present the hardware implementation of these instructions to determine the cost of the real implementation.