coherence ordering for ring- based chip multiprocessors
Post on 22-Nov-2014
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Department of Electrical Engineering and Computer Science
Coherence Ordering For Ring-Based Chip Multiprocessors
Michael R. Marty and Mark D. HillUniversity of Wisconsin—Madison
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Department of Electrical Engineering and Computer Science
Overview• Rings a viable interconnect for future CMPs.
• Cache Coherence in rings:• Ordering Point• Greedy Order
• Ring-Order:• Improves performance relative to ordering point by activating
requests immediately.• Improves performance stability relative to greedy order by
not using retries.
Department of Electrical Engineering and Computer Science
ORDERING-POINT
Department of Electrical Engineering and Computer Science
GREEDY-ORDER
Department of Electrical Engineering and Computer Science
RING-ORDER
Department of Electrical Engineering and Computer Science
THIS IS HOW CMP WITH RING LOOKS!
Department of Electrical Engineering and Computer Science
EVALUATION SYSTEM
Department of Electrical Engineering and Computer Science
RESULT: RUNTIME
Department of Electrical Engineering and Computer Science
RESULT: L2 MISSES & RING TRAFFIC
Department of Electrical Engineering and Computer Science
RESULT: MISS LATENCIES & REQUEST
Department of Electrical Engineering and Computer Science
STATE TRANSITION
Department of Electrical Engineering and Computer Science
Questions?
Department of Electrical Engineering and Computer Science
Thank You
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