LGC-ShQ: Datacenter Congestion Control with Queueless Load-based ECN Marking

Kristjon Ciko, Peyman Teymoori, Michael Welzl


We present LGC-ShQ, a new ECN-based congestion control mechanism for datacenters. LGC-ShQ relies on ECN feedback from a Shadow Queue, and it uses ECN not only to decrease the rate, but it also increases the rate in relation to this signal. Real-life tests in a Linux testbed show that LGC-ShQ keeps the real queue at low levels while achieving good link utilization and fairness.

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