Bug ID 474465: Analysis processes appear to use high CPU though not affecting data plane

Last Modified: Oct 01, 2018

Bug Tracker

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

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.1 HF5

Opened: Aug 05, 2014
Severity: 3-Major

Symptoms

The average system CPU usage and the busiest CPU in the dashboard can appear to be exceptionally high when a module with dedicated analysis processes like AVR is being used. These processes have dedicated resources so they do not impact the resources used by the critical data plane, so the high CPU usage is misleading.

Impact

The system CPU usage and busiest CPU appear to be higher than expected.

Conditions

A module such as AVR that has dedicated analysis processes must be provisioned.

Workaround

The workaround is to examine the detailed per CPU graphs and note that the high CPU is limited to the analysis processor which is the CPU with the highest number on a BIG-IP appliance.

Fix Information

Average system CPU and busiest CPU calculation is now based on the critical data plane processing.

Behavior Change

Average system CPU and busiest CPU calculation is now based on the critical data plane processing.