Handheld System Energy Reduction by OS-Driven Refresh

  • Vasily G. Moshnyaga
  • Hoa Vo
  • Glenn Reinman
  • Miodrag Potkonjak
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4148)


Emerging portable devices relay on DRAM/flash memory system to satisfy requirements on fast and large data storage and low-energy consumption. This paper presents a novel approach to reduce energy of memory system, which unlike others, lowers energy of refresh operation in DRAM. The approach is based on two key ideas: (1) DRAM-based flash cache that keeps dirty pages to reduce the number of accesses to flash memory; and (2) OS-controlled page allocation/aging to stop the refresh operations in banks, whose pages are clean and not accessed for a long time. Simulations show that by using this technique we can decrease the overall energy consumption of DRAM/flash memory on video applications by 8-26% while reducing the DRAM refresh energy by 59-74%.


Flash Memory Dynamic Random Access Memory NAND Flash NAND Flash Memory Dirty Page 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Vasily G. Moshnyaga
    • 1
  • Hoa Vo
    • 2
  • Glenn Reinman
    • 2
  • Miodrag Potkonjak
    • 2
  1. 1.Department of Electronics Engineering and Computer ScienceFukuoka UniversityFukuokaJapan
  2. 2.Computer Science DepartmentUniversity of California, Los AngelesLos AngelesUSA

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