Automatic Tcp Buuer Tuning

With the growth of high performance networking, a single host may have simultaneous connections that vary in bandwidth by as many as six orders of magnitude. We identify requirements for an automatically-tuning TCP to achieve maximum throughput across all connections simultaneously within the resource limits of the sender. Our auto-tuning TCP implementation makes use of several existing technologies and adds dynamically adjusting socket bu ers to achieve maximum transfer rates on each connection without manual con guration. Our implementation involved slight modi cations to a BSD-based socket interface and TCP stack. With these modi cations, we achieved drastic improvements in performance over large bandwidth*delay paths compared to the default system con guration, and signi cant reductions in memory usage compared to hand-tuned connections, allowing servers to support at least twice as many simultaneous connections.