Optical Circuit Granularity Impact in TCP-Dominant Hybrid Data Center Networks
Paper in proceedings, 2017

Hybrid networking, based on electronic packet switching and optical circuit switching, has been proposed to resolve the existing switching bottlenecks in data centers in an energy-efficient and cost-effective fashion. We consider the problem of resource provisioning in hybrid data centers in terms of optical circuit switching capacity and granularity. The number of fibers connected to server racks, the number of wavelengths per fiber, and the ratio of capacity provided by the optical circuit-switched portion of the network to that of the electronic packet-switched portion are crucial design parameters to be optimized during the data center planning phase. These parameters in conjunction with the additive-increase, multiplicative-decrease (AIMD) congestion control mechanism of the Transmission Control Protocol (TCP) pose a significant impact on data center network performance. In this paper, we examine the combined impact of optical bandwidth settings and TCP dynamics using event-driven simulations. Our analysis reveals the strong dependence of overall network throughput on channel capacity (i.e., the bit rate per wavelength channel) and points to the advantages of optical bandwidth consolidation employing higher-order modulation formats.

Author

Houman Rastegarfar

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

Kamran Keykhosravi

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

Krzysztof Szczerba

Chalmers, Signals and Systems

Erik Agrell

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

L. LaComb

University of Arizona

M. Glick

University of Arizona

2017 International Conference on Computing, Networking and Communications, ICNC 2017

318-322 7876147

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

DOI

10.1109/ICCNC.2017.7876147

ISBN

978-1-5090-4588-4