Bug ID 876249: Top command shows tmm 0.0% CPU usage under load

Last Modified: May 27, 2020

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3

Opened: Feb 03, 2020
Severity: 4-Minor

Symptoms

On BIG-IP Virtual Edition (VE) running in KVM, the 'top' command shows tmm as having 0.0% CPU usage. This is a Red Hat known issue and has been fixed under the RHEL7.5 kernel.

Impact

Top command shows inaccurate CPU usage

Conditions

-- BIG-IP KVM VE with NIC provisioned from OVS-DPDK bridge (Physical Intel 82599 10G NIC). -- Looking at tmm CPU usage via the top command.

Workaround

None.

Fix Information

None

Behavior Change