Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

SanYang's avatar
SanYang
Icon for Cirrostratus rankCirrostratus
Sep 14, 2023

High CPU utilization for only cpu 0

Hello, I have 26 CPUs in multi thread format but only CPU 0 utilization goes 100 and other CPUs utilization remains under 30%. # tmsh show /sys tmm-info -------------------------- Sys::TMM: 0.0 ...
application delivery
Nikoolayy1's avatar
Nikoolayy1
Icon for MVP rankMVP
Sep 16, 2023

As Mohamed_Ahmed_Kansoh mentioned check the TMM outside of that in older versions the CMP demoded VS caused such issues but we do not know your version https://my.f5.com/manage/s/article/K13033 / https://my.f5.com/manage/s/article/K14358 and this something F5 ihealth can show you.

 

As CPU is even number it means this core is for data plane as seen in the article here, so checking the TMM is good step: https://my.f5.com/manage/s/article/K23505424 / https://my.f5.com/manage/s/article/K15003

 

Ma

SanYang's avatar
SanYang
Icon for Cirrostratus rankCirrostratus
Sep 17, 2023

Hi Nikoolayy1 ,

 

Thanks for your reply.
My version is the latest (17)

# tmsh show sys tmm-info | grep Sys::TMM
Sys::TMM: 0.0      
Sys::TMM: 0.2      
Sys::TMM: 0.4      
Sys::TMM: 0.6      
Sys::TMM: 0.8      
Sys::TMM: 0.10     
Sys::TMM: 0.12     
Sys::TMM: 0.14     
Sys::TMM: 0.16     
Sys::TMM: 0.18     
Sys::TMM: 0.20     
Sys::TMM: 0.22     
Sys::TMM: 0.24