Impact of Process Variations on Multicore Performance Symmetry

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Provided by: edaa
Topic: Hardware
Format: PDF
Multi-core architectures introduce a new granularity at which process variations may occur, yielding asymmetry among cores that were designed - and that software expects - to be symmetric in performance. The chief source of this phenomenon is highly correlated, \"Systematic\" within-die variations such as optical imperfections yielding variations across the exposure field. Per-core voltages can be used to bring all cores to the same performance level, but this compensation strategy also affects power, chiefly due to leakage power.
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