NDLI: Snooping and Ordering Ring - An Efficient Cache Coherence Protocol for Ring Connected CMP

Content Provider	IEEE Xplore Digital Library
Author	Fei Cao Zhiyong Liu
Copyright Year	2009
Abstract	Ring is a promising on-chip interconnection for CMP. It is more scalable than bus and much simpler than packet-switched networks. The ordering property of ring can be used to optimize cache coherence protocol design. Existing ring protocols, such as the snooping ring protocol and the ring-order protocol need a retry and acknowledgement scheme or use the ordering property of the ring respectively to resolve conflict memory requests. A cache coherence protocol named SOR (Snooping and Ordering Ring) is developed for ring connected CMP in this paper. This protocol is based on the snooping ring protocol. But instead of using the acknowledgement and retry scheme, it uses the ordering property of the ring to resolve conflicts, thus can avoid unnecessary retries to improve performance and power efficiency. The L1 snooping results are sent with the requests instead of being delayed, so that many useless snoops can be avoided. Simulation result shows that the average probe slot transports and snoop operations can be reduced by SOR are 47% and 48.9%. The average and maximum performance improvements by SOR are 3.33% and 6%.
Starting Page	126
Ending Page	133
File Size	361657
Page Count	8
File Format	PDF
ISBN	9781424457885
ISSN	15219097
e-ISBN	9781424457892
DOI	10.1109/ICPADS.2009.32
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-08
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadcasting Bandwidth Delay Multiprocessing systems Energy consumption Access protocols Laboratories Concurrent computing Distributed computing Computer architecture ring CMP cache coherence protocol
Content Type	Text
Resource Type	Article
Subject	Hardware and Architecture

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