Implementation of TCP large receive offload on multi-core NPU platform

Nowadays, the ethernet is developing much faster than memory and CPU technologies, protocol processing has become the bottleneck of TCP performance on end systems. Modern NICs usually support offload techniques such as checksum offload and TCP Segmentation Offload(TSO), allowing the end system to offload some processing work onto the NIC hardware. In this paper, we propose an implementation of Large Receive Offload(LRO) on a multi-core NPU platform to improve TCP performance, particularly, we employ a so called active ACK mechanism to make very large packets(64KB) aggregation possible. We present experiment results to demonstrate the effectiveness of our proposal.