Research Article
Enhancing eMMC using Multi-Stream technique
@ARTICLE{10.4108/eai.15-3-2019.162141, author={Sushma Vishwakarma and Anantha Sharma and Sharath Kumar Kodase}, title={Enhancing eMMC using Multi-Stream technique}, journal={EAI Endorsed Transactions on Cloud Systems}, volume={5}, number={14}, publisher={EAI}, journal_a={CS}, year={2019}, month={3}, keywords={Embedded Multimedia Card, Multi-Stream for Storage, NAND Flash Storage, Write/Erase asymmetry in flash, Write Amplification Factor in flash}, doi={10.4108/eai.15-3-2019.162141} }
- Sushma Vishwakarma
Anantha Sharma
Sharath Kumar Kodase
Year: 2019
Enhancing eMMC using Multi-Stream technique
CS
EAI
DOI: 10.4108/eai.15-3-2019.162141
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.
Copyright © 2019 Sushma Vishwakarma et al., licensed to EAI. This is an open access article distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/3.0/), which permits unlimited use, distribution and reproduction in any medium so long as the original work is properly cited.