Adaptive channel buffers in on-chip interconnection networks - A power and performance analysis

Avinash Karanth Kodi, Ashwini Sarathy, Ahmed Louri

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Recent research in On-chip interconnection networks (OCINs) research has shown that the design of buffers in the router significantly influences the power, area overhead and overall performance of the network. In this paper, we propose a low-power, low-area OCIN architecture by reducing the number of buffers within the router. To minimize the performance degradation due to the reduced buffer size, we use the existing repeaters along the inter-router channels to double as buffers when required. At low network loads, the proposed adaptive channel buffers function as conventional repeaters propagating the signals. At high network loads, the adaptive channel buffers function as storage elements in addition to the router buffers. We evaluate the proposed adaptive channel buffers with both static and dynamic buffer allocation policies in the 90-nm technology node, using 8 × 8 mesh and folded torus network topologies. Simulation results using the SPLASH-2 suite and synthetic traffic show that by reducing the router buffer size our proposed architecture achieves nearly 40 percent savings in router buffer power, 30 percent savings in overall network power and 41 percent savings in area, with only a marginal 1-5 percent drop in throughput under dynamic buffer allocation and about 10-20 percent drop in throughput for statically assigned buffers.

Original languageEnglish (US)
Pages (from-to)1169-1181
Number of pages13
JournalIEEE Transactions on Computers
Volume57
Issue number9
DOIs
StatePublished - Aug 15 2008

Keywords

  • Adaptive channel buffers
  • Interconnect design
  • Low-power architecture
  • On-chip networks

ASJC Scopus subject areas

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computational Theory and Mathematics

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