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Proceedings Paper

Flash on disk for low-power multimedia computing
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Paper Abstract

Mobile multimedia computers require large amounts of data storage, yet must consume low power in order to prolong battery life. Solid-state storage offers low power consumption, but its capacity is an order of magnitude smaller than the hard disks needed for high-resolution photos and digital video. In order to create a device with the space of a hard drive, yet the low power consumption of solid-state storage, hardware manufacturers have proposed using flash memory as a write buffer on mobile systems. This paper evaluates the power savings of such an approach and also considers other possible flash allocation algorithms, using both hardware- and software-level flash management. Its contributions also include a set of typical multimedia-rich workloads for mobile systems and power models based upon current disk and flash technology. Based on these workloads, we demonstrate an average power savings of 267 mW (53% of disk power) using hardware-only approaches. Next, we propose another algorithm, termed Energy-efficient Virtual Storage using Application-Level Framing (EVS-ALF), which uses both hardware and software for power management. By collecting information from the applications and using this metadata to perform intelligent flash allocation and prefetching, EVS-ALF achieves an average power savings of 307 mW (61%), another 8% improvement over hardware-only techniques.

Paper Details

Date Published: 29 January 2007
PDF: 13 pages
Proc. SPIE 6504, Multimedia Computing and Networking 2007, 65040E (29 January 2007); doi: 10.1117/12.705760
Show Author Affiliations
Leo Singleton, Georgia Institute of Technology (United States)
Ripal Nathuji, Georgia Institute of Technology (United States)
Karsten Schwan, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6504:
Multimedia Computing and Networking 2007
Roger Zimmermann; Carsten Griwodz, Editor(s)

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