Enhancing eMMC using Multi-Stream technique

Vishwakarma, Sushma and Sharma, Anantha and Kodase, Sharath Kumar (2019) Enhancing eMMC using Multi-Stream technique. EAI Endorsed Transactions on Cloud Systems, 5 (14): e7. ISSN 2410-6895

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Abstract

Multi-stream for SSD is a concept where the host writes data with similar expected lifetimes to contiguous blocks of NAND memory. Consequently, this data has higher chances of being invalidated together. During garbage collection (GC), there will be minimal valid pages to copy, resulting in improved endurance and decreased write-amplification factor. Implementing Multi-stream in eMMC devices presents challenges due to lower DRAM, lower computational resource available. Maintenance of stream related information requires increase in DRAM usage, transfer buffer usage as well as addition computation for GC of stream related memory area. In this paper, we examine implementation of Multi-Stream concept in eMMC despite its low resource constraints. We have experimented with an implementation that supports up to 4 streams which uses additional ~108 bytes of DRAM and ~104 bytes of code section, and improves WAF by ~50% on FIO (File Input/Output) benchmarking setup where lifetimes are simulated by multiple instances of FIO.

Item Type: Article
Uncontrolled Keywords: Embedded Multimedia Card, Multi-Stream for Storage, NAND Flash Storage, Write/Erase asymmetry in flash, Write Amplification Factor in flash
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
QA75 Electronic computers. Computer science
Depositing User: EAI Editor II.
Date Deposited: 10 Sep 2020 12:39
Last Modified: 10 Sep 2020 12:39
URI: https://eprints.eudl.eu/id/eprint/177

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