I did not have a 224c machine I could re-imaage with new ubuntu or
upgrade the kernel. So I did that on a 112c machine.
The results are the same.
On a machine that has turbo freq upto 3.8ghz, the Freq gets capped at
3.2ghz always.
Starting sysbench CPU load on core 0 for 30 seconds...
Monitoring CPU frequency for core 0... (Sysbench PID: 1851136)
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 10000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 1094.10
General statistics:
total time: 30.0002s
total number of events: 32825
Latency (ms):
min: 0.91
avg: 0.91
max: 2.03
95th percentile: 0.92
sum: 29992.32
Threads fairness:
events (avg/stddev): 32825.0000/0.00
execution time (avg/stddev): 29.9923/0.00
Sysbench test finished. Analyzing results...
--------------------------------------------
Frequency Statistics for CPU 0:
- Samples collected: 29
- Highest frequency: 3200 MHz
- Lowest frequency: 3199 MHz
- Average frequency: 3199.55 MHz
--------------------------------------------
PRETTY_NAME="Ubuntu 24.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.2 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo
Linux kvm1 6.8.0-64-generic #67-Ubuntu SMP PREEMPT_DYNAMIC Sun Jun 15
20:23:31 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
One thing we noticed was this.
on a 112c machine, the feq always gets capped at 3.2ghz though the max is 3.8ghz
and on 224c it gets capped at 2.8ghz though the max is 3.8ghz.
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https://bugs.launchpad.net/bugs/2117253
Title:
After Upgrading to Ubuntu 22.04 the CPU frequencies get clamped and
never reach the turbo thresholds
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