Modeling and Analysis of Fault-tolerant Distributed Memories for Networks-on-Chip

Advances in technology scaling increasingly make Network-on-Chips (NoCs) more susceptible to failures that cause various reliability challenges. With increasing area occupied by different on-chip memories, strategies for maintaining fault-tolerance of distributed on-chip memories become a major design challenge. We propose a system-level design methodology for scalable fault-tolerance of distributed on-chip memories in NoCs. We introduce a novel reliability clustering model for fault-tolerance analysis and shared redundancy management of onchip memory blocks. We perform extensive design space exploration applying the proposed reliability clustering on a block-redundancy fault-tolerant scheme to evaluate the tradeoffs between reliability, performance, and overheads. Evaluations on a 64-core chip multiprocessor (CMP) with an 8x8 mesh NoC show that distinct strategies of our case study may yield up to 20% improvements in performance gains and 25% improvement in energy savings across different benchmarks, and uncover interesting design configurations.