Embedded Linux Power Management on the Intel Atom ... - MontaVista

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The Governor • Task: Decide how and when to change operating points. • Four options provided: • performance: statically set highest power operating point • powersave: statically set lowest power operating point • userspace: permit any application running as root to set the operating point • ondemand: set the operating point based on current CPU usage
More on the ondemand Governor • Works by altering the operating point to minimize idle time. • Lots of control knobs • sampling_rate • sampling_rate_max • sampling_rate_min • up_threshold • powersave_bias • ignore_nice_load
Page 1 and 2: Embedded L
Page 3 and 4: Why care about Power</stron
Page 5 and 6: Power is a large f
Page 7 and 8: How we save power Two big ways: •
Page 9 and 10: ACPI / cpufreq Software Architectur
Page 11 and 12: ACPI • ACPI is an open-industry s
Page 13 and 14: What is Deep Power
Page 15 and 16: L2 Dynamic Cache Sizing OS ACPI 8-W
Page 17 and 18: Enumerate System Devices You'll nee
Page 19 and 20: Identify Constraints Are there rela
Page 22 and 23: Define Power <stro
Page 24 and 25: Stitching it together • CPUfreq
Page 28 and 29: ondemand Governor Example
Page 30 and 31: Making Drivers Power</stron
Page 32 and 33: cpufreq Notifications • Your driv
Page 34 and 35: Saving power during idle • Idle S
Page 36 and 37: Mitigate wakeups with Power
Page 38 and 39: Free for the asking... “MontaVist

Embedded Linux Power Management on the Intel Atom ... - MontaVista

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