Design and Analysis of Hybrid Flow Control for Hierarchical Ring Network-on-Chip

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A cost-efficient network-on-chip is needed in a scalable many-core systems. Recent multicore processors have leveraged a ring topology and hierarchical ring can increase scalability but presents different challenges, including higher hop count and global ring bottleneck. In this work, we describe a hierarchical ring topology that we refer to as a transportation-network-inspired network-on-chip (tNoC) that leverages principles from transportation network systems. In particular, we propose a novel hybrid flow control for hierarchical ring topology to scale the topology efficiently. The flow control is hybrid in that the channels are allocated on flit granularity while the buffers are allocated on packet granularity. The hybrid flow control enables a simplified router microarchitecture (to minimize per-hop latency) as router input buffers are minimized and buffers are pushed to the edges, either at the output ports or at the hub routers that interconnect the local rings to the global ring-while still supporting virtual channels to avoid protocol deadlock. We describe a packet-quota-system (PQS) and a separate credit network that provide congestion management, support prioritized arbitration in the network, and provide support for multiflit packets. We also provide alternative designs for the credit network and PQS architectures. A detailed evaluation of a 64-core CMP shows that the tNoC improves performance by up to 21 percent compared with a baseline, buffered hierarchical ring topology while reducing NoC energy by 51 percent.
Publisher
IEEE COMPUTER SOC
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

INTERCONNECTION NETWORKS; TOPOLOGY

Citation

IEEE TRANSACTIONS ON COMPUTERS, v.65, no.2, pp.480 - 494

ISSN
0018-9340
DOI
10.1109/TC.2015.2417525
URI
http://hdl.handle.net/10203/208799
Appears in Collection
CE-Journal Papers(저널논문)EE-Journal Papers(저널논문)CS-Journal Papers(저널논문)
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