A small warning about Ryzen schedulers

[vladimir1986]

Hi there.

I recently purchased a Thinkpad E15 (gen4) That comes with a new as of now Ryzen CPU.

Everything fine, except for the lack of Bluetooth. As It is a fresh install, and I am not running with all ~amd64 activated, I decided to install a newer Kernel version (5.19.5) to try my luck with the Bluetooth device (wasn't lucky btw).

What I was excited about was a lot of new cpu governor optimizations, power settings, etc for Ryzen processors (and some Epyc).

Well, compiled the newer kernel, left the "ondemand" governor and rebooted to a really sluggish system.

So on the newer kernel, with those optimizations, the CPU is stuck to 400mhz. I got no issue, as the "performance governor" works well, and It is just possible to change the default, but I found it odd... In the older kernel, "ondemand" worked just fine.

Did anyone had the same issue, or I might have messed up something on the Kernel config?
6 #
35 # CPU Frequency scaling
34 #
33 CONFIG_CPU_FREQ=y
32 CONFIG_CPU_FREQ_GOV_ATTR_SET=y
31 CONFIG_CPU_FREQ_GOV_COMMON=y
30 CONFIG_CPU_FREQ_STAT=y
29 CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
28 # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
27 # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
26 # CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set
25 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
24 CONFIG_CPU_FREQ_GOV_POWERSAVE=y
23 CONFIG_CPU_FREQ_GOV_USERSPACE=y
22 CONFIG_CPU_FREQ_GOV_ONDEMAND=y
21 CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
20 CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y
19
18 #
17 # CPU frequency scaling drivers
16 #
15 CONFIG_X86_INTEL_PSTATE=y
14 # CONFIG_X86_PCC_CPUFREQ is not set
13 CONFIG_X86_AMD_PSTATE=y
12 CONFIG_X86_ACPI_CPUFREQ=y
11 CONFIG_X86_ACPI_CPUFREQ_CPB=y
10 # CONFIG_X86_POWERNOW_K8 is not set
9 CONFIG_X86_AMD_FREQ_SENSITIVITY=m
8 # CONFIG_X86_SPEEDSTEP_CENTRINO is not set
7 # CONFIG_X86_P4_CLOCKMOD is not set
6
5 #
4 # shared options