Bug ID 1084953: CPU usage increase observed in some Ramcache::HTTP tests on BIG-IP Virtual Edition

Last Modified: Dec 07, 2023

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

Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1

Fixed In:
17.1.0, 15.1.6

Opened: Mar 03, 2022

Severity: 2-Critical

Symptoms

Increase in CPU usage by 7.3% observed for Ramcache::HTTP tests.

Impact

Response delay or failure in connectivity on client side especially during peak traffic flow due to increased CPU usage.

Conditions

- BIG-IP Virtual Edition - VMWARE 40G NIC SR-IOV with 8 vCPUs unpacked 16GB - 16KB file size with 1 Request Per Connection - 16KB file size with 100 Requests Per Connection - 512KB file size with 1 Request Per Connection - 512KB file size with 100 Requests Per Connection Virtual server with the following profiles - 1. http 2. tcp profile with nagle disabled 3. web acceleration profile with following attributes - - cache-max-age 36000 - cache-object-max-size 1500001 - cache-object-min-size 1

Workaround

None.

Fix Information

The Virtual Edition network driver now processes traffic more efficiently as expected.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips