Bug ID 1033761: BIG-IP consumes excessive CPU when "Log Translation Fields" are enabled in logging policy

Last Modified: Sep 24, 2024

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

Known Affected Versions:
15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5

Opened: Jul 15, 2021

Severity: 3-Major

Symptoms

CPU utilization is excessive when logging is enabled

Impact

High CPU usage while processing less number of packets

Conditions

-- The traffic consists of UDP DNS requests being load-balanced to a back-end DNS responder. -- Caching is not being used. -- The virtual-server has a Firewall policy, a DDoS policy, a udp datagram-lb profile, and a security-log-profile (HSL). When the logging policy is present, the BIG-IP system consumes excessive CPU.

Workaround

Do not use log-translations

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips