An edge-queued datagram service for all datacenter traffic


Vladimir Olteanu, Correct Networks and University Politehnica of Bucharest; Haggai Eran, Technion and NVIDIA; Dragos Dumitrescu, Correct Networks and University Politehnica of Bucharest; Adrian Popa and Cristi Baciu, Correct Networks; Mark Silberstein, Technion; Georgios Nikolaidis, Intel; Mark Handley, UCL and Correct Networks; Costin Raiciu, Correct Networks and University Politehnica of Bucharest


Modern datacenters support a wide range of protocols and in-network switch enhancements aimed at improving performance. Unfortunately, most new and legacy protocols and enhancements often don’t coexist gracefully because they inevitably interact via queuing in the network.

In this paper we describe EQDS, a new datagram service for datacenters that moves almost all of the queuing out of the core network and into the sending host. This enables it to support multiple (conflicting) higher layer protocols, while only sending packets into the network when decided by a receiver-driven credit scheme. EQDS can speed-up legacy TCP and RDMA stacks and enable transport protocol evolution, while benefiting from future switch enhancements without needing to modify higher layer stacks. We show through simulation and multiple implementations that EQDS can reduce FCT of legacy TCP by 2x, improve the NVMeOF throughput by 30%, and safely run TCP alongside RDMA on the same network.

NSDI '22 Open Access Sponsored by
King Abdullah University of Science and Technology (KAUST)

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@inproceedings {278348,
author = {Vladimir Olteanu and Haggai Eran and Dragos Dumitrescu and Adrian Popa and Cristi Baciu and Mark Silberstein and Georgios Nikolaidis and Mark Handley and Costin Raiciu},
title = {An edge-queued datagram service for all datacenter traffic},
booktitle = {19th USENIX Symposium on Networked Systems Design and Implementation (NSDI 22)},
year = {2022},
isbn = {978-1-939133-27-4},
address = {Renton, WA},
pages = {761--777},
url = {},
publisher = {USENIX Association},
month = apr

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