Bug ID 570646: Replace numerous singly linked lists with hashmaps

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(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,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Fixed In:

Opened: Jan 29, 2016
Severity: 3-Major


A couple dozen singly linked lists can get memberships in the thousands, where some operations require scanning to search.


Slower performance as scale increases.


When IPsec gets large populations of either configured objects, or security associations for actual traffic, without hashmaps some operations would have linear cost.


There is no workaround at this time.

Fix Information

Hashmaps replace many singly linked lists, greatly reducing search time when membership population is large. In some cases, additional changes increase general stability.

Behavior Change