Issues about Changing CPU Governor

[tony_l_cai]

Hi all

     How to change default CPU Governor in Kernel driver? 3Q~

[Yuri]

  Please refer to Chapter 24 [CPU Frequency Scaling (CPUFREQ) Driver]

of “i.MX_6_Linux_Reference_Manual.pdf”. Basically You may try to change

CPUFREQ driver sources and CPU frequency working point settings, but

You have to test changes very carefully.

https://www.freescale.com/webapp/Download?colCode=L3.14.28_1.0.0_LINUX_DOCS&location=null&fpsp=1&WT_...

Have a great day,
Yuri

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[tony_l_cai]

Hi，Yuri

     I confront a problem that I cannot change the default CPU governor that I write the cmd "write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor "performance"" in init.rc when I dont comment the macro CONFIG_CPU_FREQ_GOV_CONSERVATIVE.And the default governor is conservative. Until I comment the macro CONFIG_CPU_FREQ_GOV_CONSERVATIVE,the above cmd can excute.So I want to know where has set the default governor?

3Q~

[BiyongSUN]

Please change it in the kernel configuration.

  │                                                                                                                                                                 │

  │ Prompt: Default CPUFreq governor                                                                                                                                │

  │   Location:                                                                                                                                                     │

  │     -> CPU Power Management                                                                                                                                     │

  │       -> CPU Frequency scaling                                                                                                                                  │

  │         -> CPU Frequency scaling (CPU_FREQ [=y])                                                                                                                │

  │   Defined at drivers/cpufreq/Kconfig:48                                                                                                                         │

  │   Depends on: ARCH_HAS_CPUFREQ [=y] && CPU_FREQ [=y]                                                                                                            │

  │   Selected by: ARCH_HAS_CPUFREQ [=y] && CPU_FREQ [=y] && m

[Yuri]

  Please check if Your system has “cpufrequtils”, which  includes a daemon to allow
users to set the desired scaling, governor and min/max clock speeds for all processor

cores at boot-time, using cpufreq-set utility.

Regards,

Yuri.