Application-aware prioritization mechanisms for on-chip networks

Reetuparna Das, Onur Mutlu, Thomas Moscibroda, Chita R. Das

Research output: Contribution to journalConference articlepeer-review

158 Scopus citations


Network-on-Chips (NoCs) are likely to become a critical shared resource in future many-core processors. The challenge is to develop policies and mechanisms that enable multiple applications to efficiently and fairly share the network, to improve system performance. Existing local packet scheduling policies in the routers fail to fully achieve this goal, because they treat every packet equally, regardless of which application issued the packet. This paper proposes prioritization policies and architectural extensions to NoC routers that improve the overall application-level throughput, while ensuring fairness in the network. Our prioritization policies are application-aware, distinguishing applications based on the stall-time criticality of their packets. The idea is to divide processor execution time into phases, rank applications within a phase based on stall-time criticality, and have all routers in the network prioritize packets based on their applications' ranks. Our scheme also includes techniques that ensure starvation freedom and enable the enforcement of system-level application priorities. We evaluate the proposed prioritization policies on a 64-core CMP with an 8x8 mesh NoC, using a suite of 35 diverse applications. For a representative set of case studies, our proposed policy increases average system throughput by 25.6% over age-based arbitration and 18.4% over round-robin arbitration. Averaged over 96 randomly-generated multiprogrammed workload mixes, the proposed policy improves system throughput by 9.1% over the best existing prioritization policy, while also reducing application-level unfairness.

Original languageEnglish (US)
Pages (from-to)280-291
Number of pages12
JournalProceedings of the Annual International Symposium on Microarchitecture, MICRO
StatePublished - 2009
Event42nd Annual IEEE/ACM International Symposium on Microarchitecture, Micro-42 - New York, NY, United States
Duration: Dec 12 2009Dec 16 2009

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture


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