![]() ![]() However, to provide the 3 features, existing frameworks require customized computing frameworks, customized operating systems, or specific external commercial monitoring frameworks on software-defined networking(SDN) switches. The commonly desirable critical features of existing coflow scheduling/routing framework includes (1) coflow scheduling, (2) coflow routing, and (3) per-flow rate-limiting. ![]() Researches affirm that coflow scheduling/routing substantially shortens the average application inner communication time in data center networks(DCNs). This paper justifies the design and implementation choices, and visualizes a representative selection of hundreds of thousands of experiment runs to test our claims. It acts like a semi-permeable membrane, isolating the latency of Scalable and `Classic' traffic, but coupling their capacity into a single bandwidth pool. The Dual Queue structure has been implemented as a Linux queuing discipline. It counterbalances the more aggressive response of Scalable flows with more aggressive marking, without having to inspect flow identifiers. This paper introduces an architectural solution: `Dual Queue Coupled Active Queue Management', which enables balance between Scalable and Classic flows. Flows using such congestion control are however very aggressive, which causes a deployment challenge as L4S has to coexist with so-called `Classic' flows (e.g., Reno, CUBIC). L4S exploits the properties of `Scalable' congestion controls (e.g., DCTCP, TCP Prague). When tested under a wide range of conditions emulated on a testbed using real residential broadband equipment, queue delay remained both low (median 100-300 $\mu$s) and consistent (99th percentile below 2 ms even under highly dynamic workloads), without compromising other metrics (zero congestion loss and close to full utilization). We introduce a service that offers both: Low Latency Low Loss Scalable throughput (L4S). On the Internet, sub-millisecond queueing delay and capacity-seeking have traditionally been considered mutually exclusive.
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