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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
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Original file line number | Diff line number | Diff line change |
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# The defconfigs from the RPi Kernel set "powersave" as the default CPU governor. | ||
# That is a bad idea as it reduces performance, so we unset that default option here. | ||
# The option to build the powersave governor (but not as the default) is also enabled. | ||
# A fix for this was sent to upstream: https://github.com/raspberrypi/linux/pull/5666 | ||
# but was rejected, so we need to carry this downstream | ||
CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE=n | ||
CONFIG_CPU_FREQ_GOV_POWERSAVE=y |
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