Automatic TCP buffer tuning

Abstract

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 buffers to achieve maximum transfer rates on each connection without manual configuration.Our implementation involved slight modifications to a BSD-baaed socket, interface and TCP stack. With these modifications, we achieved drastic improvements in performance over large bandwidth*delay paths compared to the default system configuration, and significant reductions in memory usage compared to hand-tuned connections, allowing servers to support at least twice as many simultaneous connections.

A large-scale data transfer method that reduces reservation bandwidth over DiffServ AF networks

“…However, there are still large differences between the throughput of this method and reserved bandwidth methods because of the characteristics of the congestion avoidance phase of TCP NewReno. The method proposed by J. Semke et al [12] limits the maximum size of TCP congestion windows and can reduce the difference in throughput to less than that of a reserved bandwidth method. However, the throughput of data transfer is small when the network is not congested.…”

“…Its purpose is to minimize the difference between reserved bandwidth and throughput. Our method sets the maximum value of the congestion window to a basic connection, which is the same as J. Semke at al's method [12]. The throughput of the basic connection is smaller than the CTR due to the limited window size.…”

Experimental evaluation of an adaptive PI rate controller for congestion control

“…network traffic generator iperf [3] and the delay simulator NetEm [4]. We follow the network adapter setting guide (such as mii-tool [5]) to confine the adapter to work at 10 Mbps, and follow the TCP performance tuning guides (such as [6]) to set optimal values for TCP parameters. The maximal router buffer size is set to twice the product, as the common assumption of Internet networking.…”

Experimental Evaluations of Gentle HighSpeed TCP for Long-Fat Networks

“…the congestion window size is halved when packet loss occurs and is increased by one packet per Round Trip Time (RTT) when no packet is dropped, limit its performance. In order to address this problem, a number of improvements have been proposed [1,[3][4][5][6][7][8].…”

“…using the Selective ACKnowledgement (SACK) option [4] and tuning the TCP socket buffer size [5]. However, TCP cannot achieve satisfactory throughput in LFNs because the TCP algorithm itself is a limitation.…”