## CPU Frequency scaling#menu "CPU Frequency scaling"source "drivers/cpufreq/Kconfig"if CPU_FREQcomment "CPUFreq processor drivers"config X86_POWERNOW_K8	tristate "AMD Opteron/Athlon64 PowerNow!"	select CPU_FREQ_TABLE	help	  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.config X86_POWERNOW_K8_ACPI	bool	depends on X86_POWERNOW_K8 && ACPI_PROCESSOR	depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)	default yconfig X86_SPEEDSTEP_CENTRINO	tristate "Intel Enhanced SpeedStep"	select CPU_FREQ_TABLE	depends on ACPI_PROCESSOR	help	  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.config X86_SPEEDSTEP_CENTRINO_ACPI	bool	depends on X86_SPEEDSTEP_CENTRINO	default yconfig X86_ACPI_CPUFREQ	tristate "ACPI Processor P-States driver"	depends on ACPI_PROCESSOR	help	  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.comment "shared options"config X86_ACPI_CPUFREQ_PROC_INTF        bool "/proc/acpi/processor/../performance interface (deprecated)"	depends on PROC_FS	depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI	help	  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.config X86_P4_CLOCKMOD	tristate "Intel Pentium 4 clock modulation"	depends on EMBEDDED	help	  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.config X86_SPEEDSTEP_LIB        tristate        default X86_P4_CLOCKMODendifendmenu