Virtual TCP offload: optimizing ethernet overlay performance on advanced interconnects

Authors:
Zheng Cui;Patrick G. Bridges;John R. Lange;Peter A. Dinda
Affiliations:
University of New Mexico, Albuquerque, NM, USA;University of New Mexico, Albuquerque, NM, USA;University of Pittsburgh, Pittsburgh, PA, USA;Northwestern University, Evanston, IL, USA
Venue:
Proceedings of the 22nd international symposium on High-performance parallel and distributed computing
Year:
2013

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Abstract

Ethernet overlay networks are a powerful tool for virtualizing networked applications. Their performance suffers on advanced interconnects such as Infiniband, however, because of differences between the semantics of Ethernet and the underlying network. In this paper, we demonstrate that providing a virtual TCP offload Ethernet device to the guest operating system dramatically improves overlay network performance on advanced interconnects like Infiniband. The virtual offload device enables the overlay system to leverage the semantics and performance characteristics of the underlying network to maximize overlay performance. Our evaluation shows that this approach allows applications to achieve near-native microbenchmark bandwidth and dramatically improved application performance compared to alternative overlay approaches when running on an Ethernet virtual overlay on a QDR Infiniband fabric.