Revamping storage class memory with hardware automated memory-over-storage solution

Jie Zhang, Miryeong Kwon, Donghyun Gouk, Sungjoon Koh, Nam Sung Kim, Mahmut Taylan Kandemir, Myoungsoo Jung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


Large persistent memories such as NVDIMM have been perceived as a disruptive memory technology, because they can maintain the state of a system even after a power failure and allow the system to recover quickly. However, overheads incurred by a heavy software-stack intervention seriously negate the benefits of such memories. First, to significantly reduce the software stack overheads, we propose HAMS, a hardware auto-mated Memory-over-Storage (MoS) solution. Specifically, HAMS aggregates the capacity of NVDIMM and ultra-low latency flash archives (ULL-Flash) into a single large memory space, which can be used as a working memory expansion or persistent memory expansion, in an OS-transparent manner. HAMS resides in the memory controller hub and manages its MoS address pool over conventional DDR and NVMe interfaces; it employs a simple hardware cache to serve all the memory requests from the host MMU after mapping the storage space of ULL-Flash to the memory space of NVDIMM. Second, to make HAMS more energy-efficient and reliable, we propose an "advanced HAMS"which removes unnecessary data transfers between NVDIMM and ULL-Flash after optimizing the datapath and hardware modules of HAMS. This approach unleashes the ULL-Flash and its NVMe controller from the storage box and directly connects the HAMS datapath to NVDIMM over the conventional DDR4 interface. Our evaluations show that HAMS and advanced HAMS can offer 97% and 119% higher system performance than a software-based NVDIMM design, while costing 41% and 45% lower energy, respectively.

Original languageEnglish
Title of host publicationProceedings - 2021 ACM/IEEE 48th Annual International Symposium on Computer Architecture, ISCA 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages14
ISBN (Electronic)9781665433334
Publication statusPublished - 2021 Jun
Event48th ACM/IEEE Annual International Symposium on Computer Architecture, ISCA 2021 - Virtual, Online, Spain
Duration: 2021 Jun 142021 Jun 19

Publication series

NameProceedings - International Symposium on Computer Architecture
ISSN (Print)1063-6897


Conference48th ACM/IEEE Annual International Symposium on Computer Architecture, ISCA 2021
CityVirtual, Online

Bibliographical note

Publisher Copyright:
© 2021 IEEE.

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture


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