Zebra Refresh: Value Transformation for Zero-Aware DRAM Refresh Reduction

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Refresh operations consume growing portions of DRAM power with increasing DRAM capacity. To reduce the power consumption of such refresh operations, this paper proposes a novel value-aware refresh reduction technique exploiting the abundance of zero values in the memory contents. The proposed Zebra refresh architecture transforms the value and mapping of DRAM data to increase consecutive zero values, and skips a refresh operation for a row containing zero values entirely. Zebra converts memory blocks to base and delta values, inspired by a prior compression technique. Once values are converted, bits are transposed to place consecutive zeros matching the refresh granularity. The experimental results show Zebra refresh can reduce DRAM refresh operations by 43 percent on average for a set of benchmark applications.
Publisher
IEEE COMPUTER SOC
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

ENERGY

Citation

IEEE COMPUTER ARCHITECTURE LETTERS, v.17, no.2, pp.130 - 133

ISSN
1556-6056
DOI
10.1109/LCA.2018.2822808
URI
http://hdl.handle.net/10203/245197
Appears in Collection
CS-Journal Papers(저널논문)
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