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CONFIG_CPU_FREQ: CPU Frequency scaling

General informations

The Linux kernel configuration item CONFIG_CPU_FREQ has multiple definitions:

found in arch/blackfin/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

If you want to enable this option, you should select the DPMC driver from Character Devices.

CPU Frequency scaling found in arch/i386/kernel/cpu/cpufreq/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

Clock scaling allows you to change the clock speed of CPUs on the fly. This is a nice method to save battery power on notebooks, because the lower the clock speed, the less power the CPU consumes.

For more information, take a look at Documentation/cpu-freq/ or at http://www.codemonkey.org.uk/projects/cpufreq/

If in doubt, say N.

CPU Frequency scaling found in arch/ppc/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

Clock scaling allows you to change the clock speed of CPUs on the fly. This is a nice method to save battery power on notebooks, because the lower the clock speed, the less power the CPU consumes.

For more information, take a look at Documentation/cpu-freq or at http://www.brodo.de/cpufreq/

If in doubt, say N.

CPU Frequency scaling found in arch/sh/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

CPU clock scaling allows you to change the clock speed of the running CPU on the fly.

For details, take a look at Documentation/cpu-freq.

If unsure, say N.

CPU Frequency scaling found in arch/sparc64/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

Clock scaling allows you to change the clock speed of CPUs on the fly. Currently there are only sparc64 drivers for UltraSPARC-III and UltraSPARC-IIe processors.

For details, take a look at Documentation/cpu-freq.

If in doubt, say N.

CPU Frequency scaling found in arch/x86_64/kernel/cpufreq/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

Clock scaling allows you to change the clock speed of CPUs on the fly. This is a nice method to save battery power on notebooks, because the lower the clock speed, the less power the CPU consumes.

For more information, take a look at Documentation/cpu-freq/ or at http://www.codemonkey.org.uk/projects/cpufreq/

If in doubt, say N.

CPU Frequency scaling found in drivers/cpufreq/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

CPU Frequency scaling allows you to change the clock speed of CPUs on the fly. This is a nice method to save power, because the lower the CPU clock speed, the less power the CPU consumes.

Note that this driver doesn't automatically change the CPU clock speed, you need to either enable a dynamic cpufreq governor (see below) after boot, or use a userspace tool.

For details, take a look at Documentation/cpu-freq.

If in doubt, say N.

Support CPU clock change (EXPERIMENTAL) found in arch/arm/Kconfig

The configuration item CONFIG_CPU_FREQ:

Help text

CPU clock scaling allows you to change the clock speed of the running CPU on the fly. This is a nice method to save battery power, because the lower the clock speed, the less power the CPU consumes. Note that this driver doesn't automatically change the CPU clock speed, you need some userland tools (which still have to be written) to implement the policy. If you don't understand what this is all about, it's safe to say 'N'.

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