Design of a Host Interface Logic for GC-Free SSDs
- Authors
- Jung, Myoungsoo; Choi, Wonil; Kwon, Miryeong; Srikantaiah, Shekhar; Yoo, Joonhyuk; Kandemir, Mahmut Taylan
- Issue Date
- Aug-2020
- Publisher
- Institute of Electrical and Electronics Engineers
- Keywords
- Garbage collection (GC); host interface; solid-state disk (SSD)
- Citation
- IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, v.39, pp 1674 - 1687
- Pages
- 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
- Volume
- 39
- Start Page
- 1674
- End Page
- 1687
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/113950
- DOI
- 10.1109/TCAD.2019.2919035
- ISSN
- 0278-0070
1937-4151
- Abstract
- Garbage collection (GC) and resource contention on I/O buses (channels) are among the critical bottlenecks in solid-state drives (SSDs) that cannot be easily hidden. Most existing I/O scheduling algorithms in the host interface logic (HIL) of state-of-the-art SSDs are oblivious to such low-level performance bottlenecks in SSDs. As a result, SSDs may violate quality of service (QoS) requirements by not being able to meet the deadlines of I/O requests. In this paper, we propose a novel host interface I/O scheduler that is both GC aware and QoS aware. The proposed scheduler redistributes the GC overheads across noncritical I/O requests and reduces channel resource contention. Our experiments with workloads from various application domains revealed that the proposed client-level SSD scheduler reduces the standard deviation for latency by 52.5% and the worst-case latency by 86.6%, compared to the state-of-the-art I/O schedulers used for the HIL. In addition, for I/O requests smaller than a superpage, the proposed scheduler avoids channel resource conflicts and reduces latency by 29.2% in comparison to the state-of-the-art I/O schedulers. Furthermore, we present an extension of the proposed I/O scheduler for enterprise SSDs based on the NVMe protocol.
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