IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Regular Section
Energy-Efficient DRAM Selective Refresh Technique with Page Residence in a Memory Hierarchy of Hardware-Managed TLB
Miseon HANYeoul NADongha JUNGHokyoon LEESeon WOOK KIMYoungsun HAN
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2018 Volume E101.C Issue 3 Pages 170-182

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Abstract

A memory controller refreshes DRAM rows periodically in order to prevent DRAM cells from losing data over time. Refreshes consume a large amount of energy, and the problem becomes worse with the future larger DRAM capacity. Previously proposed selective refreshing techniques are either conservative in exploiting the opportunity or expensive in terms of required implementation overhead. In this paper, we propose a novel DRAM selective refresh technique by using page residence in a memory hierarchy of hardware-managed TLB. Our technique maximizes the opportunity to optimize refreshing by activating/deactivating refreshes for DRAM pages when their PTEs are inserted to/evicted from TLB or data caches, while the implementation cost is minimized by slightly extending the existing infrastructure. Our experiment shows that the proposed technique can reduce DRAM refresh power 43.6% on average and EDP 3.5% with small amount of hardware overhead.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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