Bug ID 784549: Heavy CPU usage by TMM in configurations with traffic-matching-criteria

Last Modified: Mar 02, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,, 16.0.0,, 16.0.1,,

Opened: May 21, 2019
Severity: 3-Major


The Traffic Management Microkernel (TMM) processes appears very busy, imposing a heavy load on the even-numbered CPUs, in the absence of heavy network traffic or other obvious sources of workload.


CPU load is unreasonably high, which limits the amount of traffic the BIG-IP system can handle. The heavy CPU load may slow other processing, with a variety of impacts, ranging from slow user-interface response to constant restarts of processes by the sod daemon.


-- At least one virtual server is configured using the 'traffic-matching-criteria' feature, with lists of either addresses or ports.



Fix Information


Behavior Change