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SET-CMP: Improving the Lifetime of NVM Cache

  • Bhukya Krishna PriyaEmail author
  • N. Ramasubramanian
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 1025)

Abstract

NonVolatile Memory (NVM) technologies have gained more attention and are being actively followed by the industries. Though NVM deliver very low leakage and high-density, they have extremely limited write endurance. The cache replacement policies designed for traditional caches reduces the lifespan of STT-RAM cache, thus causing deeply written cache blocks to fail before the others. The existing cache management policy distributes unequal writes on both the intra and interset on the NVM. And, constant threshold values are used to either flush the data or rewrite data on the cache block to enhance its lifespan. But by using a constant threshold, the location of a cache block can be predicted, as the data will be flushed or shifted after a certain threshold and it may fail against a simple attack like RAA. To solve these problems, a SET-CMP is proposed. SET-CMP uses randomized threshold values, such that the actual cache block location can’t be predicted, it also tolerates partial cell failures by permanently flagging the failed cache lines as INVALID, hence no additional data is written into the failed cache blocks. The SET-CMP reduces the numeral ways in the resultant cache set by one, which in turn increases the lifetime by 15% and the performance gets reduced.

Keywords

Cache Write endurance Wear leveling Interset write variation Intraset write variation Lifespan improvement 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.National Institute of Technology, TiruchirappalliTiruchirappalliIndia

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