라즈베리 파이 governor 관련

머.. 별 차이도 없는 기분? 라즈베리 자체가 600MHz ~ 900Mhz 이긴한데

딱 두단계 뿐이라 클럭 조절에 대한 여유가 없는 걸지도 모르겠다.

$ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0:   driver: BCM2835 CPUFreq   CPUs which run at the same hardware frequency: 0 1 2 3   CPUs which need to have their frequency coordinated by software: 0 1 2 3   maximum transition latency: 355 us.   hardware limits: 600 MHz - 900 MHz   available frequency steps: 600 MHz, 900 MHz   available cpufreq governors: conservative, ondemand, userspace, powersave, performance   current policy: frequency should be within 600 MHz and 900 MHz.                   The governor "ondemand" may decide which speed to use                   within this range.   current CPU frequency is 600 MHz.   cpufreq stats: 600 MHz:52.90%, 900 MHz:47.10%  (9)

$ sudo cpufreq-set -g conservative $ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0:   driver: BCM2835 CPUFreq   CPUs which run at the same hardware frequency: 0 1 2 3   CPUs which need to have their frequency coordinated by software: 0 1 2 3   maximum transition latency: 355 us.   hardware limits: 600 MHz - 900 MHz   available frequency steps: 600 MHz, 900 MHz   available cpufreq governors: conservative, ondemand, userspace, powersave, performance   current policy: frequency should be within 600 MHz and 900 MHz.                   The governor "conservative" may decide which speed to use                   within this range.   current CPU frequency is 600 MHz.   cpufreq stats: 600 MHz:63.64%, 900 MHz:36.36%  (15)

$ sudo cpufreq-set -g powersave $ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0:   driver: BCM2835 CPUFreq   CPUs which run at the same hardware frequency: 0 1 2 3   CPUs which need to have their frequency coordinated by software: 0 1 2 3   maximum transition latency: 355 us.   hardware limits: 600 MHz - 900 MHz   available frequency steps: 600 MHz, 900 MHz   available cpufreq governors: conservative, ondemand, userspace, powersave, performance   current policy: frequency should be within 600 MHz and 900 MHz.                   The governor "powersave" may decide which speed to use                   within this range.   current CPU frequency is 600 MHz.   cpufreq stats: 600 MHz:74.84%, 900 MHz:25.16%  (15)

$ sudo cpufreq-set -g performance $ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0:   driver: BCM2835 CPUFreq   CPUs which run at the same hardware frequency: 0 1 2 3   CPUs which need to have their frequency coordinated by software: 0 1 2 3   maximum transition latency: 355 us.   hardware limits: 600 MHz - 900 MHz   available frequency steps: 600 MHz, 900 MHz   available cpufreq governors: conservative, ondemand, userspace, powersave, performance   current policy: frequency should be within 600 MHz and 900 MHz.                   The governor "performance" may decide which speed to use                   within this range.   current CPU frequency is 900 MHz.   cpufreq stats: 600 MHz:79.71%, 900 MHz:20.29%  (16)