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Drivers/cpufreq

cpufreq stats: 1.83 GHz:10.34%, 1.33 GHz:0.62%, 1000 MHz:89.04% (1068280)There are two important pieces of information: The statement Thegovernor"ondemand", which means that this governor is loaded and enabled. If in doubt, say Y. If you have a desktop machine then you should really be considering the 'ondemand' governor instead, however if you are using a laptop, PDA or even an AMD64 based computer (due Contents 1 Userspace tools 1.1 thermald 1.2 i7z 1.3 cpupower 2 CPU frequency driver 2.1 Setting maximum and minimum frequencies 3 Scaling governors 3.1 Tuning the ondemand governor 3.1.1 Switching threshold

For details, take a look at linux/Documentation/cpu-freq. If unsure, say N.endmenuendifendmenu Powered by Gitilestxt json 404 Not Found nginx HomePackagesForumsWikiBugsSecurityAURDownload CPU frequency scaling From ArchWiki Jump to: navigation, search Related articles Power saving Laptop Mode Tools pm-utils The governor does a periodic polling and changes frequency based on the CPU utilization. A quick example is given below, however it may be worth reading full article on acpid.

schedutil Scheduler-driven CPU frequency selection [1], [2]. As of now, the events it reacts to are: - Migration of important threads from one CPU to another. flash videos not playing smoothly or stuttering window animations). If in doubt, say N.menu "x86 CPU frequency scaling drivers"depends on X86source "drivers/cpufreq/Kconfig.x86"endmenumenu "ARM CPU frequency scaling drivers"depends on ARM || ARM64source "drivers/cpufreq/Kconfig.arm"endmenumenu "AVR32 CPU frequency scaling drivers"depends on AVR32config AVR32_AT32AP_CPUFREQ

  • Troubleshooting Check how CPU is configured Either add "CPU Frequency Scaling Monitor" to your GNOME panel, or install the package cpufrequtils and run the command cpufreq-info, which prints one block like
  • Option: CPU_FREQ_GOV_PERFORMANCE Kernel Versions: 2.6.15.6 ...
  • See how to change the on-demand governor's threshold.

For details, see the kernel documentation in the kernel source. Warning: Use CPU monitoring tools (for temperatures, voltage, etc.) when changing the default governor. For details, take a look at . You may want to enable cpupower.service to start at boot.

The governor decides what frequency should be used (it uses the CPUFreq driver to actually switch the CPU's policy). If in doubt, select 'performance'. Note: The intel_pstate driver supports only the performance and powersave governors, but they both provide dynamic scaling. tristate 'powersave' governor help This cpufreq governor sets the frequency statically to the lowest available CPU frequency.

The Intel P state driver, however, does not work on discrete P states but allows to run the processor at arbitrary clock frequencies within the allowed range. For details, take a look at . Reasons like that can be (assuming your machine's a notebook) that the battery is removed (or near death) so you're on AC-power only. So, use the arch * per-CPU loops_per_jiffy value wherever possible. */ static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) { #ifndef CONFIG_SMP static unsigned long l_p_j_ref; static unsigned int l_p_j_ref_freq; if

i7z i7z is an i7 (and now i3, i5) CPU reporting tool for Linux. The list of CPUFreq drivers available on your system can be obtained by running: /sbin/modinfo /lib/modules/$(uname -r)/kernel/arch/*/kernel/cpu/cpufreq/* | grep "^[fd]"or from linux kernel version 3.2: /sbin/modinfo /lib/modules/$(uname -r)/kernel/drivers/cpufreq/* | grep "^[fd]" This sets the frequency statically to the highest frequency supported by the CPU. tristate 'userspace' governor for userspace frequency scaling help Enable this cpufreq governor when you either want to set the CPU frequency manually or when an userspace program shall be able to

This tunable has no effect on behavior at lower CPU frequencies/loads. Allowed values for sampling_down_factor are 1 to 100000. However, userspace tools like cpupower, acpid, Laptop Mode Tools, or GUI tools provided for your desktop environment, may still be used for advanced configuration. tristate CPU frequency translation statistics select CPU_FREQ_TABLE default y help This driver exports CPU frequency statistics information through sysfs file system Option: CPU_FREQ_STAT_DETAILS Kernel Versions: 2.6.15.6 ...

Governor ?? If in doubt, say N.endmenumenu "MIPS CPUFreq processor drivers"depends on MIPSconfig LOONGSON2_CPUFREQ tristate "Loongson2 CPUFreq Driver" help This option adds a CPUFreq driver for loongson processors which support software configurable cpu In most cases, ondemand is the recommended governor. To use it without the need to enter the root password, simply create following file: /var/lib/polkit-1/localauthority/50-local.d/org.gnome.cpufreqselector.pkla [org.gnome.cpufreqselector] Identity=unix-user:user Action=org.gnome.cpufreqselector ResultAny=no ResultInactive=no ResultActive=yes Where the word user is replaced with the username

If unsure have a look at the help section of the driver. It can be launched from a Terminal with the command i7z or as GUI with i7z-gui. It is called twice on all CPU frequency changes that have * external effects. */ static void cpufreq_notify_transition(struct cpufreq_policy *policy, struct cpufreq_freqs *freqs, unsigned int state) { for_each_cpu(freqs->cpu, policy->cpus) __cpufreq_notify_transition(policy, freqs,

If in doubt, select 'performance'.config CPU_FREQ_DEFAULT_GOV_PERFORMANCE bool "performance" select CPU_FREQ_GOV_PERFORMANCE help Use the CPUFreq governor 'performance' as default.

Switching threshold To set the threshold for stepping up to another frequency: # echo -n percent > /sys/devices/system/cpu/cpufreq//up_threshold To set the threshold for stepping down to another frequency: # echo -n acpi-cpufreq CPUFreq driver which utilizes the ACPI Processor Performance States. Features Business Explore Marketplace Pricing This repository Sign in or Sign up Watch 5,657 Star 47,295 Fork 17,815 torvalds/linux Code Pull requests 153 Projects 0 Insights Pulse Graphs Branch: master This allows you to set the CPU frequency manually or when an userspace program shall be able to set the CPU dynamically without having to enable the userspace governor manually.

If in doubt, say N.config GENERIC_CPUFREQ_CPU0 tristate "Generic CPU0 cpufreq driver" depends on HAVE_CLK && REGULATOR && PM_OPP && OF help This adds a generic cpufreq driver for CPU0 frequency management. By default, it monitors CPU temperature using available CPU digital temperature sensors and maintains CPU temperature under control, before HW takes aggressive correction action. Option: CPU_FREQ_DEFAULT_GOV_USERSPACE Kernel Versions: 2.6.15.6 ... (on/off) userspace select CPU_FREQ_GOV_USERSPACE Use the CPUFreq governor 'userspace' as default. Terms Privacy Security Status Help You can't perform that action at this time.

If in doubt, say N.config CPU_FREQ_GOV_CONSERVATIVE tristate "'conservative' cpufreq governor" depends on CPU_FREQ select CPU_FREQ_GOV_COMMON help 'conservative' - this driver is rather similar to the 'ondemand' governor both in its source Here are some examples for the conservative governor: # by default it's 444, so we have to change permissions to be able to change values mode devices/system/cpu/cpufreq/conservative = 644 devices/system/cpu/cpufreq/conservative/freq_step = Not all BIOS'es limit the CPU-Frequency in this case, but for example most IBM/Lenovo Thinkpads do. If in doubt, say N.if CPU_FREQconfig CPU_FREQ_GOV_COMMON boolconfig SCHED_FREQ_INPUT bool "Scheduler inputs to cpufreq governor" depends on SCHED_HMP help This option enables support for scheduler based CPU utilization calculations which may