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Computer Science > Operating Systems

arXiv:1912.06998 (cs)
[Submitted on 15 Dec 2019]

Title:Faster than Flash: An In-Depth Study of System Challenges for Emerging Ultra-Low Latency SSDs

Authors:Sungjoon Koh, Junhyeok Jang, Changrim Lee, Miryeong Kwon, Jie Zhang, Myoungsoo Jung
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Abstract:Emerging storage systems with new flash exhibit ultra-low latency (ULL) that can address performance disparities between DRAM and conventional solid state drives (SSDs) in the memory hierarchy. Considering the advanced low-latency characteristics, different types of I/O completion methods (polling/hybrid) and storage stack architecture (SPDK) are proposed. While these new techniques are expected to take costly software interventions off the critical path in ULL-applied systems, unfortunately no study exists to quantitatively analyze system-level characteristics and challenges of combining such newly-introduced techniques with real ULL SSDs. In this work, we comprehensively perform empirical evaluations with 800GB ULL SSD prototypes and characterize ULL behaviors by considering a wide range of I/O path parameters, such as different queues and access patterns. We then analyze the efficiencies and challenges of the polled-mode and hybrid polling I/O completion methods (added into Linux kernels 4.4 and 4.10, respectively) and compare them with the efficiencies of a conventional interrupt-based I/O path. In addition, we revisit the common expectations of SPDK by examining all the system resources and parameters. Finally, we demonstrate the challenges of ULL SSDs in a real SPDK-enabled server-client system. Based on the performance behaviors that this study uncovers, we also discuss several system implications, which are required to take a full advantage of ULL SSD in the future.
Comments: 12 pages, 23 figures, 2019 IEEE International Symposium on Workload Characterization
Subjects: Operating Systems (cs.OS)
Cite as: arXiv:1912.06998 [cs.OS]
  (or arXiv:1912.06998v1 [cs.OS] for this version)
  https://doi.org/10.48550/arXiv.1912.06998

Submission history

From: Myoungsoo Jung [view email]
[v1] Sun, 15 Dec 2019 08:09:31 UTC (2,191 KB)
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