odroid cpufrequtils를 이용한 클럭 조절

특이하게도..(?)

cpu 갯수도 줄어든다??!

performance 1700 MHz / 4 core

powersave 200 MHz / 2 core

ondemand 200-1700 MHz / 2 core (바로바로 떨어지는 듯?)

conservative 200-1700MHz / 2 core (좀 클럭이 높게 유지) 

$ sudo apt-cache search cpufreq collectd-core - statistics collection and monitoring daemon (core system) cpufreqd - fully configurable daemon for dynamic frequency and voltage scaling gkrellm-cpufreq - CPU frequency plugin for GKrellM gnome-applets - Various applets for the GNOME panel - binary files indicator-cpufreq - CPU frequency scaling indicator libcpufreq-dev - development files to deal with the cpufreq Linux kernel feature libcpufreq0 - shared library to deal with the cpufreq Linux kernel feature xfce4-cpufreq-plugin - cpufreq information plugin for the Xfce4 panel xfce4-goodies - enhancements for the Xfce4 Desktop Environment cpufrequtils - cpufreq 리눅스 커널 기능을 처리하는 유틸리티 awn-applet-cpufreq - Monitors and controls the CPU frequency for Awn odroid@odroid_2:/etc/default$ sudo apt-get install cpufrequtils 패키지 목록을 읽는 중입니다... 완료 의존성 트리를 만드는 중입니다        상태 정보를 읽는 중입니다... 완료 다음 패키지를 더 설치할 것입니다:   libcpufreq0 다음 *새로운* 패키지들을 설치:   cpufrequtils libcpufreq0 0개 업그레이드, 2개 새로 설치, 0개 제거, 1개 업그레이드 안 함. 47.7 k바이트 아카이브를 받아야 합니다. 이 작업 후 280 k바이트의 디스크 공간을 더 사용하게 됩니다. Do you want to continue? [Y/n]  받기:1 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe libcpufreq0 armhf 008-1 [11.2 kB] 받기:2 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe cpufrequtils armhf 008-1 [36.5 kB] 1초에 47.7 kB 받음 (38.0 kB/s)           패키지를 미리 설정하는 중입니다... Selecting previously unselected package libcpufreq0. (데이터베이스 읽는중 ... 현재 198751개의 파일과 디렉터리가 설치되어 있습니다.) Preparing to unpack .../libcpufreq0_008-1_armhf.deb ... Unpacking libcpufreq0 (008-1) ... Selecting previously unselected package cpufrequtils. Preparing to unpack .../cpufrequtils_008-1_armhf.deb ... Unpacking cpufrequtils (008-1) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... libcpufreq0 (008-1) 설정하는 중입니다 ... cpufrequtils (008-1) 설정하는 중입니다 ...  * Loading cpufreq kernel modules...                                     [ OK ]   * CPUFreq Utilities: Setting ondemand CPUFreq governor...                       * CPU0...                                                                       * CPU1...                                                                       * CPU2...                                                                       * CPU3...                                                               [ OK ]  Processing triggers for libc-bin (2.19-0ubuntu6.9) ... $ 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: exynos_cpufreq   CPUs which run at the same hardware frequency: 0 1   CPUs which need to have their frequency coordinated by software: 0 1   maximum transition latency: 100.0 us.   hardware limits: 200 MHz - 2.00 GHz   available cpufreq governors: ondemand, conservative, userspace, powersave, performance   current policy: frequency should be within 200 MHz and 1.70 GHz.                   The governor "ondemand" may decide which speed to use                   within this range.   current CPU frequency is 200 MHz.   cpufreq stats: 2.00 GHz:0.00%, 1.92 GHz:0.00%, 1.80 GHz:0.00%, 1.70 GHz:99.06%, 1.60 GHz:0.00%, 1.50 GHz:0.01%, 1.40 GHz:0.02%, 1.30 GHz:0.00%, 1.20 GHz:0.00%, 1.10 GHz:0.02%, 1000 MHz:0.02%, 900 MHz:0.00%, 800 MHz:0.01%, 700 MHz:0.00%, 600 MHz:0.01%, 500 MHz:0.02%, 400 MHz:0.01%, 300 MHz:0.02%, 200 MHz:0.82%  (30) analyzing CPU 1:   driver: exynos_cpufreq   CPUs which run at the same hardware frequency: 0 1   CPUs which need to have their frequency coordinated by software: 0 1   maximum transition latency: 100.0 us.   hardware limits: 200 MHz - 2.00 GHz   available cpufreq governors: ondemand, conservative, userspace, powersave, performance   current policy: frequency should be within 200 MHz and 1.70 GHz.                   The governor "ondemand" may decide which speed to use                   within this range.   current CPU frequency is 200 MHz.   cpufreq stats: 2.00 GHz:0.00%, 1.92 GHz:0.00%, 1.80 GHz:0.00%, 1.70 GHz:99.06%, 1.60 GHz:0.00%, 1.50 GHz:0.01%, 1.40 GHz:0.02%, 1.30 GHz:0.00%, 1.20 GHz:0.00%, 1.10 GHz:0.02%, 1000 MHz:0.02%, 900 MHz:0.00%, 800 MHz:0.01%, 700 MHz:0.00%, 600 MHz:0.01%, 500 MHz:0.02%, 400 MHz:0.01%, 300 MHz:0.02%, 200 MHz:0.82%  (30) odroid@odroid_2:/etc/default$ cpufreq-set At least one parameter out of -f/--freq, -d/--min, -u/--max, and -g/--governor must be passed odroid@odroid_2:/etc/default$ cpufreq-set -f 900000000 Error setting new values. Common errors: - Do you have proper administration rights? (super-user?) - Is the governor you requested available and modprobed? - Trying to set an invalid policy? - Trying to set a specific frequency, but userspace governor is not available,    for example because of hardware which cannot be set to a specific frequency    or because the userspace governor isn't loaded? $ sudo cpufreq-set -g ondemand

min / max 값 조절없이 그냥 쓰기에는 performance가 가장 무난하고..

conservative는 조금 쓰면서 테스트 해봐야겠다.