Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP All
Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2
Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3 HF2
Opened: Jun 17, 2015 Severity: 2-Critical
The system CPU usage is reported as the higher of the data plane averaqe and the control plane average. In certain cases, the control plane average was being calculated at about double.
Typically, since client traffic drives data plane CPU usage, control plane CPU usage is less than data plane CPU usage at normal client loads.
When the data plane CPU usage was lower than the control plane CPU usage. This can occur when there is little client traffic flowing through the BIG-IP but the control plane is busy, say installing software.
This can safely be ignored at low data plane usage and will not be evident when data plane usage increases.
The calculation of the control plane CPU usage no longer includes other CPUs.