AVATAR: A Variable-Retention-Time (VRT) Aware Refresh for DRAM Systems

@article{Qureshi2015AVATARAV,
  title={AVATAR: A Variable-Retention-Time (VRT) Aware Refresh for DRAM Systems},
  author={Moinuddin K. Qureshi and Dae-Hyun Kim and Samira Manabi Khan and Prashant J. Nair and Onur Mutlu},
  journal={2015 45th Annual IEEE/IFIP International Conference on Dependable Systems and Networks},
  year={2015},
  pages={427-437}
}
Multirate refresh techniques exploit the non-uniformity in retention times of DRAM cells to reduce the DRAM refresh overheads. Such techniques rely on accurate profiling of retention times of cells, and perform faster refresh only for a few rows which have cells with low retention times. Unfortunately, retention times of some cells can change at runtime due to Variable Retention Time (VRT), which makes it impractical to reliably deploy multirate refresh. Based on experimental data from 24 DRAM… CONTINUE READING
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