Bug ID 716492: Rateshaper stalls when TSO packet length exceeds max ceiling.

Last Modified: Nov 07, 2022

Affected Product(s):
BIG-IP 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,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Apr 23, 2018

Severity: 3-Major

Related Article: K59332523


If a TCP Segmentation Offload (TSO) packet length exceeds the rateshaper's max ceiling, it causes the flow to stall.


The flow stalls. Subsequent flows cannot go to the rateshaper from that particular tmm.


TSO packet length exceeds the rateshaper's configured max ceiling.


If you are running BIG-IP software v12.1.3.2 (or later) or v13.1.0(.x), you can use the following workaround: There is a sys db variable called 'rateshaper.cmpdivide', which is enabled by default. When enabled, the system internally divides the bandwidth (rate/ceiling/burst) between the available tmm cores. If this issue occurs, set 'rateshaper.cmpdivide' to enabled. There is no workaround for other versions.

Fix Information

Rateshaper no longer stalls when TSO packet length exceeds max ceiling.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips