Bug ID 948985: Workaround to address Nitrox 3 compression engine hang

Last Modified: Apr 29, 2023

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3

Fixed In:

Opened: Sep 27, 2020

Severity: 3-Major


Occasionally the Nitrox3 compression engine hangs. In /var/log/ltm: crit tmm[12404]: 01010025:2: Device error: n3-compress0 Nitrox 3, Hang Detected: compression device was reset (pci 02:00.1, discarded 1). crit tmm[12404]: 01010025:2: Device error: n3-compress0 Zip engine ctx eviction (comp_code=0): ctx dropped.


The Nitrox3 hardware compression system becomes unavailable, and the compression mode switches to software compression. This can lead to high CPU usage.


The BIG-IP system uses Nitrox 3 hardware compression chips: 5xxx, 7xxx, 12250, and B2250. You can check if your platform has nitrox3 by running the following command: tmctl -w 200 compress -s provider provider -------- bzip2 lzo nitrox3 <-------- zlib


Disable HTTP compression or use software compression.

Fix Information

Added db key compression.nitrox3.dispatchsize to control the request size.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips