Transportation-Network-Inspired 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 topolog 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 also 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. A detailed evaluation of a 64-core CMP shows that the tNoC improves performance by up to 21% compared with a baseline, buffered hierarchical ring topology while reducing NoC energy by 51%.
Publisher
IEEE
Issue Date
2014-02-18
Language
English
Citation

The 20th IEEE International Symposium On High Performance Computer Architecture (HPCA-2014), pp.332 - 343

DOI
10.1109/HPCA.2014.6835943
URI
http://hdl.handle.net/10203/187813
Appears in Collection
CS-Conference Papers(학술회의논문)CE-Conference Papers(학술회의논문)EE-Conference Papers(학술회의논문)
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