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Datacenter applications frequently cause incast congestion, which degradesboth flow completion times of short flows and throughput of long flows. Withoutisolating incast, existing congestion control schemes (e.g., DCTCP) rely onexisting ECN signal to react to general congestion, and they lose performancedue to their slow, cautious, and inaccurate reaction to incast. We propose toisolate incast using Explicit Incast Notifications (EIN) that are generated byswitches, similar to ECN. Our incast detection is fast and accurate. Further,we present our congestion control scheme, called Pulser, which drasticallybacks off during incast based on EIN, but restores sending rate once incastends. Our real experiments and ns-3 simulations show that Pulser outperformsprior schemes, DCTCP and ICTCP, in both flow completion times and throughput.

Pulser: Fast Congestion Response using Explicit Incast Notifications for Datacenter Networks