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Desktop computers are an attractive focus for energy savings as they are both a substantial component of enterprise energy consumption and are frequently unused or otherwise idle. Indeed, past studies have shown large power savings if such machines could simply be powered down when not in use. Unfortunately, while contemporary hardware supports low power "Sleep" modes of operation, their use in desktop PCs has been curtailed by application expectations of "Always on" Network Connectivity. In this paper, the authors describe the architecture and implementation of SleepServer, a system that enables hosts to transition to such low-power sleep states while still maintaining their application's expected network presence using an on-demand proxy server.
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