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

Forum Discussion

Amrishinweb's avatar
Amrishinweb
Icon for Nimbostratus rankNimbostratus
3 years ago

High CPU utilization for only cpu 0

I have 8 CPUs in multi thread format but only CPU 0 utilization goes 100 and rest 7 CPUs utilization remains under 30%. I am using 2 LTM in active-active mode and it is happening for both the LTMs. ...
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boneyard's avatar
boneyard
Icon for MVP rankMVP
3 years ago

Multiple things are in play here. Half your CPUs are for data, the others for management. So the question quickly is which of the two types are going to 100%.

See: https://support.f5.com/csp/article/K15003

I dont quite see the 100% on one in your screenshots. in principle it should be shared over multiple CPUs, but that is if you haven't turned off CMP.

See: https://support.f5.com/csp/article/K14358

Have a go at sharing what Amine is asking, to go in real detail it might be better to open a support ticket. With someone actually looking in your environment things can become easier.