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Proceedings Article

Flash on disk for low-power multimedia computing

[+] Author Affiliations
Leo Singleton, Ripal Nathuji, Karsten Schwan

Georgia Institute of Technology

Proc. SPIE 6504, Multimedia Computing and Networking 2007, 65040E (January 29, 2007); doi:10.1117/12.705760
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From Conference Volume 6504

  • Multimedia Computing and Networking 2007
  • Roger Zimmermann; Carsten Griwodz
  • San Jose, CA, USA | January 28, 2007

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.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Leo Singleton ; Ripal Nathuji and Karsten Schwan
"Flash on disk for low-power multimedia computing", Proc. SPIE 6504, Multimedia Computing and Networking 2007, 65040E (January 29, 2007); doi:10.1117/12.705760; http://dx.doi.org/10.1117/12.705760


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