Bug ID 1121517: Interrupts on Hyper-V are pinned on CPU 0

Last Modified: May 22, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 17.0.0, 17.0.0.1, 17.0.0.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3

Fixed In:
16.1.4, 15.1.10

Opened: Jun 24, 2022

Severity: 3-Major

Symptoms

CPU 0 utilization is much higher relative to other CPUs due to high amount of softirq.

Impact

Performance is degraded.

Conditions

BIG-IP is deployed on a Hyper-V platform.

Workaround

None

Fix Information

Interrupts are balanced across all CPUs.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips