Bug ID 570646: Replace numerous singly linked lists with hashmaps

Last Modified: Apr 10, 2019

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, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1

Fixed In:
13.0.0

Opened: Jan 29, 2016
Severity: 3-Major

Symptoms

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

Impact

Slower performance as scale increases.

Conditions

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

Workaround

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