NDLI: Probabilistic Distance-Based Arbitration: Providing Equality of Service for Many-Core CMPs

Content Provider	IEEE Xplore Digital Library
Author	Lee, M.M. Kim, J. Abts, D. Marty, M. Lee, J.W.
Copyright Year	2010
Abstract	Emerging many-core chip multiprocessors will integrate dozens of small processing cores with an on-chip interconnect consisting of point-to-point links. The interconnect enables the processing cores to not only communicate, but to share common resources such as main memory resources and I/O controllers. In this work, we propose an arbitration scheme to enable equality of service (EoS) in access to a chip’s shared resources. That is, we seek to remove any bias in a core’s access to a shared resource based on its location in the CMP. We propose using probabilistic arbitration combined with distance-based weights to achieve EoS and overcome the limitation of conventional round-robin arbiter. We describe how nonlinear weights need to be used with probabilistic arbiters and propose three different arbitration weight metrics – fixed weight, constantly increasing weight, and variably increasing weight. By only modifying the arbitration of an on-chip router, we do not require any additional buffers or virtual channels and create a simple, low-cost mechanism for achieving EoS. We evaluate our arbitration scheme across a wide range of traffic patterns. In addition to providing EoS, the proposed arbitration has additional benefits which include providing quality-of-service features (such as differentiated service) and providing fairness in terms of both throughput and latency that approaches the global fairness achieved with age-base arbitration – thus, providing a more stable network by achieving high sustained throughput beyond saturation.
Starting Page	509
Ending Page	519
File Size	1891674
Page Count	11
File Format	PDF
ISBN	9781424490714
ISSN	10724451
DOI	10.1109/MICRO.2010.18
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probabilistic logic Measurement Bandwidth System-on-a-chip Routing Quality of service Throughput quality of service (QoS) on-chip network age-based arbitration fairness
Content Type	Text
Resource Type	Article

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