ISPASS '03 Proceedings of the 2003 IEEE International Symposium on Performance Analysis of Systems and Software
Optimizing TCP receive performance
ATC'08 USENIX 2008 Annual Technical Conference on Annual Technical Conference
PacketShader: a GPU-accelerated software router
Proceedings of the ACM SIGCOMM 2010 conference
A new server I/O architecture for high speed networks
HPCA '11 Proceedings of the 2011 IEEE 17th International Symposium on High Performance Computer Architecture
End system optimizations for high-speed TCP
IEEE Communications Magazine
Netmap: a novel framework for fast packet I/O
USENIX ATC'12 Proceedings of the 2012 USENIX conference on Annual Technical Conference
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Network stack performance is critical to server scalability and user-perceived application experience. Perpacket overhead is a major bottleneck in scaling network I/O. While much effort is expended on reducing perpacket overhead for data-carrying packets, small control packets such as pure TCP ACKs have received relatively scarce attention. In this paper, we show that ACK receive processing can consume up to 20% cycles in server applications. We propose a simple kernel-level optimization which reduces this overhead through fewer memory allocations and a simplified code path. Using this technique, we demonstrate cycles savings of 15% in a Web application, and 33% throughput improvement in reliable multicast.