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Measurement Lab (M-Lab) is an open, distributed server platform on which researchers have deployed measurement tools. Its mission is to measure the Internet, save the data and make it universally accessible and useful. This paper serves as an update on ...

The TCP Macroscopic Model will be completely obsolete soon. It was a closed form performance model for Van Jacobson's landmark congestion control algorithms presented at Sigcomm'88. Jacobson88 requires relatively large buffers to function as intended, ...

Testing today's increasingly complex network protocol implementations can be a painstaking process. To help meet this challenge, we developed packetdrill, a portable, open-source scripting tool that enables testing the correctness and performance of ...

This document describes an experimental Proportional Rate Reduction (PRR) algorithm as an alternative to the widely deployed Fast Recovery and Rate-Halving algorithms. These algorithms determine the amount of data sent by TCP during loss recovery. PRR ...

This document proposes an experiment to increase the permitted TCP initial window (IW) from between 2 and 4 segments, as specified in RFC 3390, to 10 segments with a fallback to the existing recommendation when performance issues are detected. It ...

YouTube traffic is bursty. These bursts trigger packet losses and stress router queues, causing TCP's congestion-control algorithm to kick in. In this paper, we introduce Trickle, a server-side mechanism that uses TCP to rate limit YouTube video ...

Packet losses increase latency for Web users. Fast recovery is a key mechanism for TCP to recover from packet losses. In this paper, we explore some of the weaknesses of the standard algorithm described in RFC 3517 and the non-standard algorithms ...

The current Internet fairness paradigm mandates that all protocols have equivalent response to packet loss and other congestion signals, allowing relatively simple network devices to attain a weak form of fairness by sending uniform signals to all ows. ...

This paper describes a tool to diagnose network performance problems commonly affecting TCP-based applications. The tool, pathdiag, runs under a web server framework to provide non-expert network users with one-click diagnostic testing, tuning support ...

IPv4 fragmentation is not sufficiently robust for use under some conditions in today's Internet. At high data rates, the 16-bit IP identification field is not large enough to prevent frequent incorrectly assembled IP fragments, and the TCP and UDP ...

This document describes extended performance statistics for TCP. They are designed to use TCP's ideal vantage point to diagnose performance problems in both the network and the application. If a network-based application is performing poorly, TCP can ...

This document describes a robust method for Path MTU Discovery (PMTUD) that relies on TCP or some other Packetization Layer to probe an Internet path with progressively larger packets. This method is described as an extension to RFC 1191 and RFC 1981, ...

TCP has become the dominant protocol for all network data transport because it presents a simple uniform data delivery service which is sufficient for most applications over all types of lower network layers. By its very nature, TCP's adaption and ...

Many high performance distributed applications require high network throughput but are able to achieve only a small fraction of the available bandwidth. A common cause of this problem is improperly tuned network settings. Tuning techniques, such as ...

The process of putting together the SIGCOMM technical program was a challenging one. There were a record 300 submissions this year with authors from well over a hundred different institutions. The program committee selected 25 papers, which we've ...

NIMI (National Internet Measurement Infrastructure) is a software system for building network measurement infrastructures. Its design emphasizes large-scale infrastructures composed from diversely-administered hosts, rather than infrastructures ...

This note defines an extension of the Selective Acknowledgement (SACK) Option [RFC2018] for TCP. RFC 2018 specified the use of the SACK option for acknowledging out-of-sequence data not covered by TCP's cumulative acknowledgement field. This ...

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 ...

In this paper, we analyze a performance model for the TCP Congestion Avoidance algorithm. The model predicts the bandwidth of a sustained TCP connection subjected to light to moderate packet losses, such as loss caused by network congestion. It assumes ...