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We are hitting below customer issue as explained briefly below.
UCS C220 M5
Firmware 4.0(2f) - standalone
Ubuntu 16.04.5 LTS with 4.15.0-29-generic kernel (HWE)
The customer is looking to force the CPU frequency to stay on max value. Ubuntu 
detects variable speeds (the CPU cores are going down to 800 MHz):
Bios is not setting all CPU cores to maximum frequency in Ubuntu.
Bios settings are as below.
- Disabled Intel speedstep
- Disabled TurboBoost
- Limited to C0/C1 only with disabled extended states
- Disabled P states, or reduced as much as possible
- Set profiles to max performance
- Control for CPU performance is done via BIOS, not OS
- CPU performance is Enterprise
The issue is also not seen on another C220 M5SX without NVMe drives running 
3.1(3i). Same kernel version for Ubuntu.
Downgrading the firmware on one of the affected C220 M5s doesn't resolve the 
All the cores are running on max frequency after applying the below command at 
the OS level:
tuned-adm profile latency-performance

So please let us know is this BIOS or Ubuntu issue?

I . will attach logs soon.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

Bios is not setting CPU cores to maximum frequency
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