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Future many-core chips will require an on-chip network that can support broadcasts and multicasts at good power-performance. A vanilla on-chip network would send multiple unicast packets for each broadcast packet, resulting in latency, throughput and power overheads. Recent research in on-chip multicast support has proposed forking of broadcast/multicast packets within the network at the router buffers, but these techniques are far from ideal, since they increase buffer occupancy which lowers throughput, and packets incur delay and power penalties at each router.
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