FastDrain: Removing Page Victimization Overheads in NVMe Storage Stack

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Host-side page victimizations can easily overflow the SSD internal buffer, which interferes I/O services of diverse user applications thereby degrading user-level experiences. To address this, we propose FastDrain, a co-design of OS kernel and flash firmware to avoid the buffer overflow, caused by page victimizations. Specifically, FastDrain can detect a triggering point where a near-future page victimization introduces an overflow of the SSD internal buffer. Our new flash firmware then speculatively scrubs the buffer space to accommodate the requests caused by the page victimization. In parallel, our new OS kernel design controls the traffic of page victimizations by considering the target device buffer status, which can further reduce the risk of buffer overflow. To secure more buffer spaces, we also design a latency-aware FTL, which dumps the dirty data only to the fast flash pages. Our evaluation results reveal that FastDrain reduces the 99th response time of user applications by 84 percent, compared to a conventional system.
Publisher
IEEE COMPUTER SOC
Issue Date
2020-07
Language
English
Article Type
Article
Citation

IEEE COMPUTER ARCHITECTURE LETTERS, v.19, no.2, pp.92 - 96

ISSN
1556-6056
DOI
10.1109/LCA.2020.3005507
URI
http://hdl.handle.net/10203/275853
Appears in Collection
EE-Journal Papers(저널논문)
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