22.04 Intel Turboboost Issue

[DuckHook]

I don't know how much help such a deep dive gives to the OP, but I am thankful for the guru insights and find these insights not only fascinating, but very useful.

@fournogo

You have nothing to lose by implementing MAFoElffen's suggestion—add the described boot parameter to your grub and try it out. Given that you are posting for the first time, here are the step‑by‑step instructions:

1. Make sure you have a LiveUSB of Ubuntu to recover from in case you make a mistake and render your system unbootable.
2. Open a terminal, then:

   sudo nano /etc/default/grub

3. Find the line that reads:

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

4. Edit this to read:

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=4"

5. <Ctrl>+<o> to save the file
6. <Ctrl>+<x> to exit nano
7. Write the change to your boot file with:

   sudo update-grub

8. Reboot

Let us know how it goes.

[Doug S]

"Turboboost is dependent on workload, temperatures, & number of active cores. With more cores active the less boost you get, usually dropping to none at all cores active."

Seems (from all concerned) that TurboBoots is heavily dependent on the power available to the CPU, along with many other factors. (not just one switch)

I respect your knowledge of testing Kernels for Ubuntu and such. Just saying that there is more involved.

Yes, all very true. Thanks for clarifying.

turbostat without the --quiet parameter will list max frequency verses active cores. Example:

...
34 * 100.0 = 3400.0 MHz base frequency
cpu5: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
cpu5: MSR_TURBO_RATIO_LIMIT: 0x23242526
35 * 100.0 = 3500.0 MHz max turbo 4 active cores
36 * 100.0 = 3600.0 MHz max turbo 3 active cores
37 * 100.0 = 3700.0 MHz max turbo 2 active cores
38 * 100.0 = 3800.0 MHz max turbo 1 active cores
...