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

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Determine degrees of power management freedom for each device For each device study what can be controlled to optimize power management • Voltage: operating voltages of the CPU or peripherals • Frequency: alter bus frequencies Document the operating ramifications of altering each of these parameters • Will altering the PLL frequency impose a lengthy settling time? 18
Identify Constraints Are there relationships between devices in the system that will constrain the frequency and voltage settings? • For example: Does Bluetooth require a certain bus frequency to operate at the speeds required? • Does the bus frequency mandate a certain CPU voltage? 19
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: Enumerate System Devices You'll nee
Page 22 and 23: Define Power <stro
Page 24 and 25: Stitching it together • CPUfreq
Page 26 and 27: The Governor • Task: Decide how a
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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