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• W3003669500 abstract "Deployed congestion control algorithms rely on end hosts to figure out how congested the network is. Initially, for TCP, the congestion signal was packet drops; a binary signal that kicks in only after the congestion is well underway. More recently, the trend has been towards using RTT as a congestion signal instead (e.g. Timely and BBR). But RTT is a noisy surrogate for congestion; it contains a valuable signal about congestion at the bottleneck but also includes noise from the queuing delay at the non-bottlenecked switches. Taking a step back, it is worth asking: Why don't the switches and routers simply tell us the actual congestion they are experiencing? After all, they must keep track of the precise occupancy of their own queues anyway; they can directly tell the end-hosts. Conventional wisdom said this is too expensive (in terms of additional bits in headers, or complexity and power consumption). We argue that even if this was once the case, it no longer is. Today, it is quite feasible, with negligible increase in power or lost capacity, to report the precise queuing delay at the switches, allowing the end hosts to make more accurate decisions when minimizing required buffering. We explore how this might work using modern programmable switches and NICs that stamp each packet with the queue occupancy (or the maximum queue occupancy along the path), which can be thought of as a multi-bit ECN signal. We provide evidence that the resulting signal is a more accurate indication of congestion at the flow's bottleneck and can lead to higher link utilization and shorter flow completion times than RTT-based algorithms. Consequently, it becomes easier to control required buffer sizes. Our goal here is not to argue for a particular multi-bit ECN algorithm, but to point out that in the future, there is no longer a need to rely on noisy RTT measurements at the edges." @default.
• W3003669500 created "2020-02-07" @default.
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• W3003669500 date "2019-12-02" @default.
• W3003669500 modified "2023-10-15" @default.
• W3003669500 title "Switches Know the Exact Amount of Congestion" @default.
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• W3003669500 doi "https://doi.org/10.1145/3375235.3375245" @default.
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