SC13 Home > SC13 Schedule > SC13 Presentation - Channel Reservation Protocol for Over-Subscribed Channels and Destinations

SCHEDULE: NOV 16-22, 2013

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Channel Reservation Protocol for Over-Subscribed Channels and Destinations

SESSION: Inter-Node Communication


TIME: 10:30AM - 11:00AM

SESSION CHAIR: Rajeev Thakur

AUTHOR(S):George Michelogiannakis, Nan Jiang, Daniel U. Becker, William J. Dally


Channels in system-wide networks tend to be over-subscribed due to the cost of bandwidth and increasing traffic demands. To make matters worse, workloads can overstress specific destinations, creating hotspots. Lossless networks offer attractive advantages compared to lossy networks but suffer from tree saturation. This led to the development of explicit congestion notification (ECN). However, ECN is very sensitive to its configuration parameters and acts only after congestion forms. We propose channel reservation protocol (CRP) to enable sources to reserve bandwidth in multiple resources in advance of packet transmission and with a single request, but without idling resources like circuit switching. CRP prevents congestion from ever occurring and thus reacts instantly to traffic changes, whereas ECN requires 300,000 cycles to stabilize in our experiments. Furthermore, ECN may not prevent congestion formed by short-lived flows generated by a large combination of sourcedestination pairs.

Chair/Author Details:

Rajeev Thakur (Chair) - Argonne National Laboratory

George Michelogiannakis - Stanford University and Lawrence Berkeley National Laboratory

Nan Jiang - Stanford University

Daniel U. Becker - Stanford University

William J. Dally - Stanford University and NVIDIA Corporation

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The full paper can be found in the ACM Digital Library