Presentation Information
[B-16-21]A Study on Multipath Rate Control Using Shared Delay Signals
〇KHUN SINT THAN THAR1, Aung Han Nay1, Hiroyuki Ohsaki1 (1. Kwansei Gakuin University)
Keywords:
Data Center Networks,Congestion Control,Multi-path Rate Control
In data center communication, achieving both short flow completion times and high bandwidth utilization is essential. This requirement is particularly critical in environments where application processing is divided into many short communications, because the delay of a small subset of flows can directly determine the completion time of the entire process. For this reason, senders should not wait for packet loss, but instead use increasing delay as an early indication of congestion. Swift is a representative example of such delay-based congestion control and has been shown to be effective for low-latency communication in data centers.
In practical data centers, however, multiple candidate paths often exist between a sender and a receiver. If delay-based control designed for a single path is independently applied to each path, traffic tends to concentrate on the path with slightly lower delay, and then shifts to another path after queues build up on the initially preferred path. This interaction induces oscillations in the traffic-splitting ratio that do not arise in single-path control. The objective of this paper is to abstract the notion of delay signals and to suppress such splitting-ratio oscillations in multipath environments by tightly coupling the control of sending rates and traffic-splitting ratios across multiple paths.
In practical data centers, however, multiple candidate paths often exist between a sender and a receiver. If delay-based control designed for a single path is independently applied to each path, traffic tends to concentrate on the path with slightly lower delay, and then shifts to another path after queues build up on the initially preferred path. This interaction induces oscillations in the traffic-splitting ratio that do not arise in single-path control. The objective of this paper is to abstract the notion of delay signals and to suppress such splitting-ratio oscillations in multipath environments by tightly coupling the control of sending rates and traffic-splitting ratios across multiple paths.