TCP Vegas revisited

Hengartner, Urs; Bolliger, Jürg; Gross, T.

doi:10.1109/infcom.2000.832553

Cited by 101 publications

(73 citation statements)

References 13 publications

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“…relevance in the context of this survey (it has been shown that other elements of the protocol can sometimes play a greater role for its overall behavior [29]). In congestion avoidance, once per RTT, TCP Vegas calculates the expected throughput as: T e = WindowSize/BaseRTT, where WindowSize is the current congestion window and BaseRTT is the minimum of all measured RTTs.…”

Section: A Tcp Vegasmentioning

confidence: 89%

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Less-than-Best-Effort Service: A Survey of End-to-End Approaches

Ros

Welzl

2013

IEEE Commun. Surv. Tutorials

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Abstract-This paper provides a survey of transport protocols and congestion control mechanisms that are designed to have a smaller bandwidth and/or delay impact on standard TCP than standard TCP itself when they share a bottleneck with it. Such protocols and mechanisms provide what is sometimes called a less-than-best-effort or lower than best-effort service. To a user, such a service can, for instance, be an attractive choice for applications which create traffic that is considered less urgent than that of others-e.g., automatic backup, software updates running in the background, or peer-to-peer applications. The focus of this survey is on end-host approaches for achieving a lessthan-best-effort service. This includes e.g. upper-layer methods, or techniques that leverage standard transport-layer mechanisms so as to reduce the impact on other competing flows.Index Terms-Transport protocols; congestion control; quality of service; less-than-best effort service.

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Section: A Tcp Vegasmentioning

confidence: 89%

“…[20], [29]- [33]. One of the most prominent properties of TCP Vegas is its fairness between multiple flows of the same kind, which does not penalize flows with large propagation delays in the same way as standard TCP.…”

Section: A Tcp Vegasmentioning

confidence: 99%

Less-than-Best-Effort Service: A Survey of End-to-End Approaches

Ros

Welzl

2013

IEEE Commun. Surv. Tutorials

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“…But, TCP-Vegas [8] introduces multiple modifications to TCP. Hengartner et al [13] studied the individual impact of every modification proposed in TCP-Vegas. They showed that the Vegas congestion control scheme based on the round trip time has a marginal (sometimes negative) impact on the performance gain of TCP Vegas.…”

Section: Related Workmentioning

confidence: 99%

De-Randomizing" Congestion Losses to Improve TCP Performance over Wired-Wireless Networks"

Biaz¹,

Vaidya²

2004

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Currently, a TCP sender considers all losses as congestion signals and reacts to them by throttling its sending rate. With Internet becoming more heterogeneous with more and more wireless error-prone links, a TCP connection may unduly throttle its sending rate and experience poor performance over paths experiencing random losses unrelated to congestion. The problem of distinguishing congestion losses from random losses is particularly hard when congestion is light: congestion losses themselves appear to be random. The key idea is to "de-randomize" congestion losses. This paper proposes a simple biased queue management scheme that "de-randomizes" congestion losses and enables a TCP receiver to diagnose accurately the cause of a loss and inform the TCP sender to react appropriately. Bounds on the accuracy of distinguishing wireless losses and congestion losses are analytically established and validated through simulations. Congestion losses are identified with an accuracy higher than 95% while wireless losses are identified with an accuracy higher than 75%. A closed form is derived for the achievable improvement by TCP endowed with a discriminator with a given accuracy. Simulations confirm this closed form. TCP-Casablanca, a TCP-Newreno endowed with the proposed discriminator at the receiver, yields through simulations an improvement of more than 100% on paths with low levels of congestion and about 1% random wireless packet loss rates. TCP-Ifrane, a sender-based TCP-Casablanca yields encouraging performance improvement.

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“…In order to improve TCP performance, significant research has been done to improve TCP congestion control [16,13,10,9]. Other complementary research has been done to improve flow control [11,14,5].…”

Section: Introductionmentioning

confidence: 99%

Making a Case for Proactive Flow Control in Optical Circuit-Switched Networks

Kumar

Chaube

Balaji

et al. 2008

High Performance Computing - HiPC 2008

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Abstract. Optical circuit-switched networks such as National LambdaRail (NLR) offer dedicated bandwidth to support large-scale bulk data transfer. Though a dedicated circuit-switched network eliminates congestion from the network itself, it effectively "pushes" the congestion to the end hosts, resulting in lower-than-expected throughput. Previous approaches either use an ad-hoc proactive approach that does not generalize well or a sluggish reactive approach where the sending rate is only adapted based on synchronous feedback from the receiver. We address the shortcomings of such approaches using a two-step process. First, we improve the adaptivity of the reactive approach by proposing an asynchronous, fine-grained, rate-based approach. While this approach enhances performance, its limitation is that it is still reactive. Consequently, we then analyze the predictive patterns of load on the receiver and provide strong evidence that a proactive approach is not only possible, but also necessary, to achieve the best performance in dynamically varying end-host conditions.

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TCP Vegas revisited

Cited by 101 publications

References 13 publications

Less-than-Best-Effort Service: A Survey of End-to-End Approaches

Less-than-Best-Effort Service: A Survey of End-to-End Approaches

De-Randomizing" Congestion Losses to Improve TCP Performance over Wired-Wireless Networks"

Making a Case for Proactive Flow Control in Optical Circuit-Switched Networks

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