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The Slow Path Needs an Accelerator Too!

The Slow Path Needs an Accelerator Too! Packet-processing data planes have been continuously enhanced in performance over the last few years to the point that, nowadays, they are increasingly implemented in hardware (i.e., in SmartNICs and programmable switches). However, little attention is given to the slow path residing between the data plane and the control plane, as it is not typically considered performance-critical. In this paper, we show that the slow path is set to become a new key bottleneck in Software-Defined Networks (SDNs). This is due to the growth in physical network bandwidth (200 Gbps is becoming common in data centers) and topological complexity (e.g., virtual switches now span hundreds of physical machines). We present our vision of a new Domain Specific Accelerator (DSA) for the slow path at the end host that sits between the hardware-offloaded data plane and the logically-centralized control plane. We discuss open problems in this domain and call on the networking community to creatively address this emerging issue. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ACM SIGCOMM Computer Communication Review Association for Computing Machinery

The Slow Path Needs an Accelerator Too!

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Publisher
Association for Computing Machinery
Copyright
Copyright © 2023 Copyright is held by the owner/author(s)
ISSN
0146-4833
DOI
10.1145/3594255.3594259
Publisher site
See Article on Publisher Site

Abstract

Packet-processing data planes have been continuously enhanced in performance over the last few years to the point that, nowadays, they are increasingly implemented in hardware (i.e., in SmartNICs and programmable switches). However, little attention is given to the slow path residing between the data plane and the control plane, as it is not typically considered performance-critical. In this paper, we show that the slow path is set to become a new key bottleneck in Software-Defined Networks (SDNs). This is due to the growth in physical network bandwidth (200 Gbps is becoming common in data centers) and topological complexity (e.g., virtual switches now span hundreds of physical machines). We present our vision of a new Domain Specific Accelerator (DSA) for the slow path at the end host that sits between the hardware-offloaded data plane and the logically-centralized control plane. We discuss open problems in this domain and call on the networking community to creatively address this emerging issue.

Journal

ACM SIGCOMM Computer Communication Review – Association for Computing Machinery

Published: Apr 20, 2023

Keywords: DSA

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