Gentoo   

 Pietinger : Kernel Configuration 
 sys-kernel/gentoo-sources
 gentoo.org  
 forums.gentoo 
linux.org
https://wiki.gentoo.org/wiki/Power_management/Processor
https://wiki.gentoo.org/wiki/Power_management/Processor/en


Kernel  - 260503
# make -j7 && make modules_install && make install
# grub-mkconfig -o /boot/grub/grub.cfg

ebuilds
/var/db/repos/gentoo/sys-kernel/gentoo-kernel

Step 1: Lock the Linux CPU Governor to PerformanceBy default, your Linux system likely uses the powersave or schedutil governor, which scales frequencies independently per core. You can force all cores to request their maximum frequency:Install the CPU power tools for your distribution:Ubuntu/Debian: sudo apt install linux-tools-genericFedora: sudo dnf install kernel-toolsArch Linux: sudo pacman -S cpupowerSet all cores to performance mode:bashsudo cpupower frequency-set -g performance Verify the changes:bashwatch -n 1 "grep MHz /proc/cpuinfo" Note: Even in performance mode, modern Intel CPUs may still show slightly different speeds across cores due to hardware-level Turbo Boost metrics.Step 2: Configure UEFI/BIOS Settings (ASUS Rampage IV)If you want strict consistency where every core runs at an identical speed under load, you need to change your ASUS AI Tweaker settings in the BIOS:Reboot your computer and tap Del or F2 to enter the UEFI BIOS.Navigate to the Ai Tweaker tab.Locate CPU Core Ratio (or Turbo Ratio). Change it from Auto or Per Core to Sync All Cores.Set your desired multiplier (e.g., 40 for 4.0 GHz).(Optional) For a Flat, Non-Fluctuating Clock SpeedIf you are troubleshooting latency issues and want to completely disable downclocking:In Ai Tweaker > CPU Power Management, disable Intel SpeedStep (EIST).In Advanced > CPU Configuration, disable all Intel C-States.Warning: Disabling these features means your CPU will pull maximum power and generate high heat even when completely idle.Press F10 to save your settings and reboot back into Linux.