Edit /boot/cmdline.txt and add maxcpus=N
[링크 : https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=99372]
[링크 : https://www.raspberrypi.org/forums/viewtopic.php?t=152692]
USB 허브 끄기 - 단, 네트워크도 죽어버림(그럼 도대체 어떻게 쓰란거지 -ㅁ-?)
#!/bin/bash #Code to stop /etc/init.d/networking stop echo 0 > /sys/devices/platform/bcm2708_usb/buspower; echo “Bus power stopping” #!/bin/bash #Code to start echo 1 > /sys/devices/platform/bcm2708_usb/buspower; echo “Bus power starting” sleep 2; /etc/init.d/networking start |
video output 끄기
This tip has been suggested by many people. If your system is headless (no video output) you can turn off the HDMI port with: sudo /opt/vc/bin/tvservice -o to turn it back on: sudo /opt/vc/bin/tvservice -p This command will save you around 20-30mA. |
[링크 : https://babaawesam.com/2014/01/24/power-saving-tips-for-raspberry-pi/]
/sys/devices/system/cpu/cpu0/online 이 있으면 논리적으로 on/off 가능하다는데
라즈베리에는
/sys/devices/system/cpu/online
/sys/devices/system/cpu/offline 만 존재한다.
[링크 : https://stackoverflow.com/questions/44907731/programmatically-disable-cpu-core]
+
$ chcpu Usage: chcpu [options] Options: -h, --help print this help -e, --enable <cpu-list> enable cpus -d, --disable <cpu-list> disable cpus -c, --configure <cpu-list> configure cpus -g, --deconfigure <cpu-list> deconfigure cpus -p, --dispatch <mode> set dispatching mode -r, --rescan trigger rescan of cpus -V, --version output version information and exit |
라즈베리에서는 안되네..
$ sudo chcpu -r chcpu: This system does not support rescanning of CPUs $ sudo chcpu -e 2 chcpu: CPU 2 is not hot pluggable |
+
/sys/devices/system/cpu/cpufreq/ondemand $ cat up_threshold 50 |
[링크 : https://raspberrypi.stackexchange.com/questions/9034/how-to-change-the-default-governor]
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