On DELL EMC PowerEdge system when Ubuntu 22.04.1 OS is Installed, Unable to Interpret the values in cpuinfo_max_freq and cpuinfo_min_freq sysfs files as per the Intel specs document.
Steps to Reproduce:
1. Install one CPU that supports DBS "Demand-Based Power Management".
2. Install Ubuntu 22.04.1 OS.
2. Enable "Logical Processor" under CPU Information menu from F2 setup.
3. Save changes and reboot to Ubuntu 22.04.1 OS.
4. Right click on "Computer" and select "File system" and check for the following CPU directories.
5. View the Max Frequency and Min Frequency under CPU0 and CPU1 directory.
6. The Max and Min Frequency did not match as per the Intel specs datasheet.
[Impact]
On DELL EMC PowerEdge system when Ubuntu 22.04.1 OS is Installed, Unable to Interpret the values in cpuinfo_max_freq and cpuinfo_min_freq sysfs files as per the Intel specs document.
Steps to Reproduce:
1. Install one CPU that supports DBS "Demand-Based Power Management".
2. Install Ubuntu 22.04.1 OS.
2. Enable "Logical Processor" under CPU Information menu from F2 setup.
3. Save changes and reboot to Ubuntu 22.04.1 OS.
4. Right click on "Computer" and select "File system" and check for the following CPU directories.
/sys/ devices/ system/ cpu/cpu0/ cpufreq/ cpu0 devices/ system/ cpu/cpu0/ cpufreq/ cpu1
/sys/
5. View the Max Frequency and Min Frequency under CPU0 and CPU1 directory.
6. The Max and Min Frequency did not match as per the Intel specs datasheet.
Actual results:
/sys/devices/ system/ cpu/cpu0/ cpufreq/ cpu0/cpuinfo_ max_freq -> 6800000 system/ cpu/cpu0/ cpufreq/ cpu0/cpuinfo_ min_freq -> 800000 system/ cpu/cpu0/ cpufreq/ cpu0/base_ frequency -> 3900000
/sys/devices/
/sys/devices/
Expected results: As per Intel datasheet specification.
/sys/devices/ system/ cpu/cpu0/ cpufreq/ cpu0/cpuinfo_ max_freq -> 5300 MHz system/ cpu/cpu0/ cpufreq/ cpu0/cpuinfo_ min_freq -> 800 MHz system/ cpu/cpu0/ cpufreq/ cpu0/base_ frequency -> 3000 MHz
/sys/devices/
/sys/devices/
[Fix] /github. com/torvalds/ linux/commit/ 0fcfc9e51990246 a9813475716746f f5eb98c6aa [github.com]
cpufreq: intel_pstate: Fix scaling for hybrid-capable systems with disabled E-cores
https:/
[Test Plan]
Same as steps to reproduce
[ Where problems could occur ]
[ Other Info ]
Jammy /code.launchpad .net/~mreed8855 /ubuntu/ +source/ linux/+ git/jammy/ +ref/cpuinfo_ freq
https:/
lunar /code.launchpad .net/~mreed8855 /ubuntu/ +source/ linux/+ git/lunar/ +ref/cpuinfo_ freq_lunar_ 2
https:/
Mantic /code.launchpad .net/~mreed8855 /ubuntu/ +source/ linux/+ git/mantic/ +ref/cpuinfo_ freq_mantic
https:/