Private bug reported:
Description of problem:
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
/sys/devices/system/cpu/cpu0/cpufreq/cpu1
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
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_min_freq -> 800000
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/base_frequency -> 3900000
Expected results: As per Intel datasheet specification.
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_max_freq -> 5300 MHz
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_min_freq -> 800 MHz
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/base_frequency -> 3000 MHz
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Information type changed from Public to Private
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https://bugs.launchpad.net/bugs/2026687
Title:
[Ubuntu 22.04.1] Unable to interpret the frequency values in
cpuinfo_min_freq and cpuino_max_freq sysfs files.
Status in linux package in Ubuntu:
New
Bug description:
Description of problem:
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
/sys/devices/system/cpu/cpu0/cpufreq/cpu1
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
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_min_freq -> 800000
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/base_frequency -> 3900000
Expected results: As per Intel datasheet specification.
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_max_freq -> 5300 MHz
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/cpuinfo_min_freq -> 800 MHz
/sys/devices/system/cpu/cpu0/cpufreq/cpu0/base_frequency -> 3000 MHz
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