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How to configure the Linux kernel/arch/x86 64/kernel/cpufreq

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Howto configure the Linux kernel / arch / x86_64 / kernel / cpufreq


CPU Frequency scaling

CPU Frequency scalingEdit

CPU_FREQ

"CPUFreq processor drivers"


  • Option: X86_POWERNOW_K8
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) AMD Opteron/Athlon64 PowerNow!
    • select CPU_FREQ_TABLE
      This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
      For details, take a look at <file:Documentation/cpu-freq/>.
      If in doubt, say N.


  • Option: X86_POWERNOW_K8_ACPI
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
    • depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
    • default y


  • Option: X86_SPEEDSTEP_CENTRINO
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Intel Enhanced SpeedStep
    • select CPU_FREQ_TABLE
    • depends on ACPI_PROCESSOR
      This adds the CPUFreq driver for Enhanced SpeedStep enabled mobile CPUs. This means Intel Pentium M (Centrino) CPUs or 64bit enabled Intel Xeons.
      For details, take a look at <file:Documentation/cpu-freq/>.
      If in doubt, say N.


  • Option: X86_SPEEDSTEP_CENTRINO_ACPI
    • Kernel Versions: 2.6.15.6 ...
    • (on/off)
    • depends on X86_SPEEDSTEP_CENTRINO
    • default y


  • Option: X86_ACPI_CPUFREQ
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) ACPI Processor P-States driver
    • depends on ACPI_PROCESSOR
      This driver adds a CPUFreq driver which utilizes the ACPI Processor Performance States.
      For details, take a look at <file:Documentation/cpu-freq/>.
      If in doubt, say N.

"shared options"


  • Option: X86_ACPI_CPUFREQ_PROC_INTF
    • Kernel Versions: 2.6.15.6 ... bool /proc/acpi/processor/../performance interface (deprecated)
    • depends on PROC_FS
    • depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI
      This enables the deprecated /proc/acpi/processor/../performance interface. While it is helpful for debugging, the generic, cross-architecture cpufreq interfaces should be used.
      If in doubt, say N.


  • Option: X86_P4_CLOCKMOD
    • Kernel Versions: 2.6.15.6 ...
    • (on/off/module) Intel Pentium 4 clock modulation
    • depends on EMBEDDED
      This adds the clock modulation driver for Intel Pentium 4 / XEON processors. When enabled it will lower CPU temperature by skipping clocks.
      This driver should be only used in exceptional circumstances when very low power is needed because it causes severe slowdowns and noticeable latencies. Normally Speedstep should be used instead.
      For details, take a look at <file:Documentation/cpu-freq/>.
      Unless you are absolutely sure say N.



  • Option: X86_SPEEDSTEP_LIB
    • Kernel Versions: 2.6.15.6 ... tristate default X86_P4_CLOCKMOD




Linux Kernel Configuration

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