FEC killed the cut-through switch
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Peer-reviewed
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Abstract
Latency penalty in Ethernet links beyond 10Gb/s is due to forward error correction (FEC) blocks. In the worst case a single-hop penalty approaches the latency of an entire cutthrough switch. Latency jitter is also introduced, making latency prediction harder, with large peak to peak variance. These factors stretch the tail of latency distribution in Rackscale systems and Data Centers, which in turn degrades performance of distributed applications. We analyse the underlying mechanisms, calculate lower bounds and propose a different approach that would reduce the penalty, allow control over latency and feedback for application level optimisation.
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Keywords
4901 Applied Mathematics, 49 Mathematical Sciences
Journal Title
NEAT 2018 - Proceedings of the 2018 Workshop on Networking for Emerging Applications and Technologies, Part of SIGCOMM 2018
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SIGCOMM '18: ACM SIGCOMM 2018 Conference
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ACM
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Sponsorship
Leverhulme Trust (ECF-2016-289)
Isaac Newton Trust (1608(as))
Isaac Newton Trust (1608(as))
Rudin foundation, Isaac Newton trust, Leverhulme trust, Microsoft research