IMDEA Networks Institute Publications Repository

Performance of Quantized Congestion Notification in TCP Incast scenarios in data centers

Devkota, Prajjwal and Narasimha Reddy, A.L. (2010) Performance of Quantized Congestion Notification in TCP Incast scenarios in data centers. In: The 18th Annual Meeting of the IEEE International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (IEEE MASCOTS 2010), 17-19 August 2010, Miami Beach, Florida, USA.

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Abstract

This paper analyzes the performance of Ethernet layer congestion control mechanism Quantized Congestion Noti- fication (QCN) during data access from clustered servers in data centers. We analyze the reasons why QCN does not perform adequately in these situations and propose several modifications to the protocol to improve its performance in these scenarios. We trace the causes of QCN performance degradation to flow rate variability, and show that adaptive sampling at the switch and adaptive self-increase of flow rates at the rate limiter improve performance in a TCP Incast setup significantly. We compare the performance of QCN against TCP modifications in a heterogeneous environment, and show that modifications to QCN yield better performance.

Item Type: Conference or Workshop Papers (Paper)
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
Depositing User: Acosta Angel
Date Deposited: 16 Feb 2012 12:07
Last Modified: 04 May 2017 12:03
URI: http://eprints.networks.imdea.org/id/eprint/131

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