Bug ID 1128689: Performance improvement in signature engine

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP ASM(all modules)

Known Affected Versions:
15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,

Fixed In:
16.1.4, 15.1.9

Opened: Jul 25, 2022

Severity: 3-Major


The signature engine in BD uses more CPU cycles than it actually needs to complete the task.


Slower system performance High CPU utilization with BD


ASM provisioned and in use


For header-based signatures that appear on the top in ACY_PERF, the header exclusions can be added only on explicit headers. This should decrease the CPU usage.

Fix Information

Some modifications are done to the signature engine to improve performance.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips