The delay-friendliness of TCP

Eli Brosh, Salman Abdul Baset, Dan Rubenstein, Henning Schulzrinne
2008 Proceedings of the 2008 ACM SIGMETRICS international conference on Measurement and modeling of computer systems - SIGMETRICS '08  
TCP has traditionally been considered unfriendly for realtime applications. Nonetheless, popular applications such as Skype use TCP since UDP packets cannot pass through many NATs and firewalls. Motivated by this observation, we study the delay performance of TCP for real-time media flows. We develop an analytical performance model for the delay of TCP. We use extensive experiments to validate the model and to evaluate the impact of various TCP mechanisms on its delay performance. Based on our
more » ... esults, we derive the working region for VoIP and live video streaming applications and provide guidelines for delay-friendly TCP settings. Our research indicates that simple application-level schemes, such as packet splitting and parallel connections, can reduce the delay of real-time TCP flows by as much as 30% and 90%, respectively.
doi:10.1145/1375457.1375464 dblp:conf/sigmetrics/BroshBRS08 fatcat:ujke6lg4hzeabdpye4rfysrjzy