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This commit fixes and closes #16313. Switch the x86 kernel's timer to tickless operation which is more power efficient since it is not woken up by periodic timer interrupts when idle. Also add several other options for CPU idle governors particularly the upstream default for tickless kernels, CONFIG_CPU_IDLE_GOV_MENU. Without this commit, my AMD Ryzen 7 5800U can only achieve a minimum core frequency of 1,384 MHz which is over 3x higher than the processor's minimum frequency of 400 MHz which is accessible with this modification. In addition to the lower clock rate, I have seen a concomitant reduction in both idle temps and at-the-wall power consumption. Summary: * Idle CPU freqs dropped from 1,384 MHz to 400 Mhz. * Idle power consumption dropped from 7 W avg to 5 W. * Idle temps have dropped from 50C on avg to 43C. There are other well known reasons to switch to a tickless timer including: reduced interrupt overhead, better use of CPU resources, and reduced latency to name a few. Build system: x86/64 Build-tested: x86/64/AMD Cezanne Run-tested: x86/64/AMD Cezanne Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/16317 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> |
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