Bug ID 681256: Virtual Edition GTM DNS Query Performance Degradation

Last Modified: Jul 12, 2023

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,

Fixed In:

Opened: Aug 31, 2017

Severity: 1-Blocking


The transaction rate for a DNS A record request synthetic test was up to fourteen percent lower for the BIG-IP Virtual Edition Release 13.1.0 compared to Release 13.0.0.


The DNS transaction rate is up to fourteen percent lower on BIG-IP Virtual Edition 13.1.0 compared to 13.0.0.


BIG-IP Virtual Edition 13.1.0 is deployed on a vSphere 6.0 or 6.5 system. Traffic consists solely of DNS A record requests at the rate of 700,000 requests per second. Ingress traffic is handled by an EXSi Intel ixgbe driver.


DNS performance can be restored by altering the TMM scheduler maximum sleep duration to 250 usec. To do so, run the following command: tmsh modify sys db scheduler.maxsleepduration.ltm value 250000 The 250 usec value will improve DNS performance on a 10 GbE NIC, but reduce TCP performance on a 40 GbE NIC.

Fix Information

Virtual Edition GTM DNS Query Performance Degradation has been addressed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips