Bug ID 1347949: High CPU for bd process under specific conditions

Last Modified: Dec 05, 2024

Affected Product(s):
BIG-IP ASM, Install/Upgrade(all modules)

Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4

Fixed In:
17.1.2

Opened: Sep 03, 2023

Severity: 3-Major

Symptoms

The bd process shows high CPU load. If you are upgrading, CPU utilization of bd is noticeably higher than it was in the previous version.

Impact

High CPU utilization by bd.

Conditions

A policy has signature overrides for a specific header.

Workaround

Remove the header signature override. Consider disabling the header on the URL level or the policy level (instead of a specific header)

Fix Information

The internal parameter enable_header_fastlru_cache controls the cache. It has to be set to 0 to disable the cache in case it reduces the performance.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips