Bug ID 667469: Higher than expected CPU usage when using DNS Cache

Last Modified: Dec 10, 2018

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3

Fixed In:
14.0.0, 13.1.0.4, 13.0.1, 12.1.3.2

Opened: Jun 01, 2017
Severity: 3-Major
Related AskF5 Article:
K35324588

Symptoms

CPU usage shows higher than expected usage when using the DNS Cache.

Impact

Higher than expected CPU usage.

Conditions

Usage of any of the 3 DNS Cache types, particularly on chassis with multiple blades.

Workaround

No workaround at this time.

Fix Information

Improvements have been made to the efficiency of the DNS Cache inter-tmm mirroring. These efficiencies may result in better CPU utilization and/or higher responses per second.

Behavior Change