Commits on Dec 13, 2023

1. configs/raspberrypi*: stop setting powersave as the default CPU governor …

   * The defconfigs from the RPi Kernel set `powersave` as the default
     CPU governor, which is a bad idea as that reduces performance by
     setting the CPU frequency to the minimum one.
   
   * In case of a buildroot build user-space is not configured by default
     to change the CPU governor, so `powersave` will remain the CPU
     governor and it will slow down everything.
   
   * This patch unsets the selection of `powersave` as the default CPU
     governor.
   
   * Then the CPU governor that will be selected as default after this
     patch will be the Linux's default one that is either one of:
     `ondemand`, `schedutil` or `performance` depending on the Kernel
     version and the hardware. For modern Kernels (>v5.6) `schedutil`
     is the one preferred for ARM hardware. See Linux Kernel commit:
     https://git.kernel.org/linus/f259eab3ea0e7e
   
   * This patch was submitted upstream (both to the RPi kernel defconfigs
     and to upstream buildroot but was not accepted). See:
     https://lists.buildroot.org/pipermail/buildroot/2023-October/677641.html
     and raspberrypi/linux#5666
   
   * In oder to update all the defconfigs this command can be used:
   
     for f in configs/raspberrypi*_defconfig; do
       if ! grep -q "board/raspberrypi/default-cpu-governor.fragment" "$f"; then
         sed -i 's,BR2_LINUX_KERNEL=y,BR2_LINUX_KERNEL=y\nBR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/raspberrypi/default-cpu-governor.fragment",' "$f"
       fi
     done

   

   clopez committed Dec 13, 2023
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