Queues don’t matter when you can Jump them!

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• Matthew P. Grosvenor, University of Cambridge Computer Laboratory
• Friday 01 May 2015, 15:00-16:00
• Auditorium, Microsoft Research Ltd, 21 Station Road, Cambridge, CB1 2FB.

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In this talk I will be discussing our recent system called QJump. QJump is a simple and immediately deployable approach to controlling network interference in datacenter networks. Network interference occurs when congestion from throughput-intensive applications causes queueing that delays traffic from latency-sensitive applications.

To mitigate network interference, QJump applies Internet QoS-inspired techniques to datacenter applications. Each application is assigned to a latency sensitivity level (or class). Packets from higher levels are rate-limited in the end host, but once allowed into the network can “jump-the-queue” over packets from lower levels. In settings with known node counts and link speeds, QJump can support service levels ranging from strictly bounded latency (but with low rate) through to line-rate throughput (but with high latency variance).

We have implemented QJump as a Linux Traffic Control module. QJump achieves bounded latency and reduces in-network interference by up to 300×, outperforming Ethernet Flow Control (802.3x), ECN (WRED) and DCTCP . We also show that QJump improves average flow completion times, performing close to or better than DCTCP and pFabric.

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