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  1. Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications (SIGCOMM '04)
  2. Sizing router buffers
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A first-principles approach to understanding the internet's router-level topology
Locating internet bottlenecks: algorithms, measurements, and implications
Optimizing cost and performance for multihoming
Link-level measurements from an 802.11b mesh network
A system for authenticated policy-compliant routing
Locating internet routing instabilities
Building a better NetFlow
Sizing router buffers
Impact of configuration errors on DNS robustness
Mercury: supporting scalable multi-attribute range queries
Back to the future part 4: the internet
Vivaldi: a decentralized network coordinate system
An algebraic approach to practical and scalable overlay network monitoring
A comparison of overlay routing and multihoming route control
Comparison of routing metrics for static multi-hop wireless networks
SPV: secure path vector routing for securing BGP
Diagnosing network-wide traffic anomalies
Work-conserving distributed schedulers for Terabit routers
A wavelet-based approach to detect shared congestion
The design and implementation of a next generation name service for the internet
Modeling and performance analysis of BitTorrent-like peer-to-peer networks
Routing design in operational networks: a look from the inside
CapProbe: a simple and accurate capacity estimation technique
The feasibility of supporting large-scale live streaming applications with dynamic application end-points
Routing in a delay tolerant network
Shield: vulnerability-driven network filters for preventing known vulnerability exploits
Network sensitivity to hot-potato disruptions
Exact GPS simulation with logarithmic complexity, and its application to an optimally fair scheduler
Delayed stability and performance of distributed congestion control
A layered naming architecture for the internet
A scalable distributed information management system
Turning the postal system into a generic digital communication mechanism

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Sizing Router Buffers (2004)

Proceeding

Sizing router buffers

Content Provider ACM Digital Library
Author Keslassy, Isaac Appenzeller, Guido McKeown, Nick
Abstract All Internet routers contain buffers to hold packets during times of congestion. Today, the size of the buffers is determined by the dynamics of TCP's congestion control algorithm. In particular, the goal is to make sure that when a link is congested, it is busy 100% of the time; which is equivalent to making sure its buffer never goes empty. A widely used rule-of-thumb states that each link needs a buffer of size B = overlineRTT x C, where overlineRTT is the average round-trip time of a flow passing across the link, and C is the data rate of the link. For example, a 10Gb/s router linecard needs approximately 250ms x 10Gb/s = 2.5Gbits of buffers; and the amount of buffering grows linearly with the line-rate. Such large buffers are challenging for router manufacturers, who must use large, slow, off-chip DRAMs. And queueing delays can be long, have high variance, and may destabilize the congestion control algorithms. In this paper we argue that the rule-of-thumb (B = (overlineRTT x C) is now outdated and incorrect for backbone routers. This is because of the large number of flows (TCP connections) multiplexed together on a single backbone link. Using theory, simulation and experiments on a network of real routers, we show that a link with n flows requires no more than B = (overlineRTT x C) √n, for long-lived or short-lived TCP flows. The consequences on router design are enormous: A 2.5Gb/s link carrying 10,000 flows could reduce its buffers by 99% with negligible difference in throughput; and a 10Gb/s link carrying 50,000 flows requires only 10Mbits of buffering, which can easily be implemented using fast, on-chip SRAM.
Starting Page 281
Ending Page 292
Page Count 12
File Format PDF
ISBN 1581138628
DOI 10.1145/1015467.1015499
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2004-08-30
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Tcp Buffer size Bandwidth delay product Internet router
Content Type Text
Resource Type Article
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