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Green99: Saving Desktop Energy using SleepServer. Joshua Reich (Intern), Michel Goraczko, Aman Kansal, Jitu Padhye – MSR Redmond. Problem. Enable idle desktops to sleep, while minimizing disruption to users. Solution. 1. Idle machine informs SleepServer before going to sleep.

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  1. Green99: Saving Desktop Energy using SleepServer Joshua Reich (Intern), Michel Goraczko, Aman Kansal, Jitu Padhye – MSR Redmond Problem Enable idle desktops to sleep, while minimizing disruption to users Solution 1. Idle machine informs SleepServer before going to sleep 2. SleepServer takes over MAC/IP addr of sleeping machine by sending ARP Probe 3. Traffic meant for sleeping machine is redirected to sleep server WAN Subnet Router WAN WAN Subnet Router Subnet Router ARP Probe Notification Sleep Server Sleeping Desktop Sleep Server Sleeping Desktop Sleep Server Idle Desktop 4. SleepServer wakes up sleeping machine by sending WoL upon receiving “important” traffic or events 5. Subsequent traffic is sent to the now-awake machine WAN WAN Subnet Router Subnet Router WoL Sleep Server Sleep Server Desktop Desktop Challenges Results • Existing connections break • Not a problem in typical • corporate environments. • Applications that depend on outgoing connections may be delayed (e.g. LiveMesh, LiveSync) • Live deployment in MSR • Used by 50+ users over 4 months • (Including lab director) • Typical machine sleeps > 40% of time • IT causes most wakeups • Sleeping machine responds in 8-9 seconds Most of the savings come from long sleeps (typically at night)

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