NDLI: Combining ECN and RTT for Datacenter Transport

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Combining ECN and RTT for Datacenter Transport

Content Provider	ACM Digital Library
Author	Zhu, Yibo Bai, Wei Chen, Ge Zeng, Gaoxiong Chen, Kai Han, Dongsu
Abstract	Datacenter transports should provide low average and tail flow completion times (FCT) to achieve desired application performance. While most prior datacenter transports take either ECN or RTT as congestion signal, this paper makes a case that both signals are indispensable: ECN, as a per-hop signal, is more effective to prevent packet loss; while RTT, as an end-to-end signal, controls end-to-end queueing delay better. As persistent low flow completion times imply low queueing delay and near zero packet loss, we introduce EAR, a new datacenter transport that hears and reacts to both ECN and RTT. Our preliminary results show that: 1) compared to delay-based DCTCP, EAR achieves up to 91% lower packet losses and 93% fewer timeouts; 2) compared to ECN-based DCTCP, EAR reduces RTT by up to 32% for cross-rack traffic in a 4-level fattree. As a result, EAR delivers persistent low average and tail completion times under various scenarios in large scale simulations.
Starting Page	36
Ending Page	42
Page Count	7
File Format	PDF
ISBN	9781450352444
DOI	10.1145/3106989.3107002
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-08-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Congestion signal Ecn Rtt Datacenter networks Transport protocol
Content Type	Text
Resource Type	Article

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