A Simple Integrated Network Interface for High-Bandwidth Servers

Abstract

High-bandwidth TCP/IP networking places a significant burden on end hosts. We argue that this issue should be addressed by integrating simple network interface controllers (NICs) more closely with host CPUs, not by pushing additional computation out to the NICs. We present a simple integrated NIC design (SINIC) that is significantly less complex and more flexible than a conventional DMA-descriptor-based NIC but performs as well or better than the conventional NIC when both are integrated onto the processor die. V-SINIC, an extended version of SINIC, provides virtual per-packet registers, enabling packet-level parallel processing while maintaining a FIFO model. V-SINIC also enables deferring the copy of the packet payload on receive, which we exploit to implement a zero-copy receive optimization in the Linux 2.6 kernel. This optimization improves bandwidth by over 50 % on a receive-oriented microbenchmark.