Travis Downs

Putting this in draft as I'll test this in a custom install pack first.

> I have set the frequency of all cores to min=5100MHz and max=5100MHz at performance mode with the tool cpupower-gui. > Now the frequency of all the cores is show...

> The clock numbers(Unhalt_GHz) seems not right here ? Yes, they look wrong. The problem is the `MHZ` variable. It is should actually be TSC frequency not CPU frequency (in...

@edisonchan - those frequency values (last column) look much better. Try to collect your results again with `MHZ=3504` and you should get a better result. This whole rigamarole is because...

That's interesting. Note that these tests assume a transition for "light" AVX-512 instructions, but as I [found on Ice Lake](https://travisdowns.github.io/blog/2020/08/19/icl-avx512-freq.html), light AVX-512 may not cause a frequency transition at all...

> ya, here is my results: > https://drive.google.com/file/d/1NSHa9QCQdis95hP14vhPNmNnpBdqmw7x/view?usp=sharing Thank you! Based on that, I'd say this RKL chip basically has no "license" based downclocking: it runs at 5.1 GHz for...

> of course, you can use the results. Thanks! I added a section [to this blog post](https://travisdowns.github.io/blog/2020/08/19/icl-avx512-freq.html#rocket-lake) based on your results, and credited you. I parsed your name as "Edison...

You shouldn't have to do anything special to make it run at 5.2 or 5.3 GHz, but the theory is it doesn't happen because the test pins to core 0...

> The system was connected via ssh, not on my hand, It had updated to last bios. Hi Edison - do you mean that since the earlier results and the...

@saurabhtangri thanks for the report. This can occur if the msr kernel module isn't loaded. Does the file `/dev/cpu/0/msr` exist? What does `lsmod | grep msr` report? You try `modprobe...