Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Jason_40733's avatar
Jason_40733
Icon for Cirrocumulus rankCirrocumulus
Jul 18, 2014

iRule Efficiency Global vs Local variable

We have a pair of clustered (active/standby) F5s running 10.2.0 HF1 LTM module. Our systems are CMP enabled ( two processors ). Currently one processor stays at 99-100% CPU 24/7. The second process...
application delivery
devops
irules
David_Larsen's avatar
David_Larsen
Icon for Employee rankEmployee
Jul 18, 2014

Jason, The bigger issue to take into account is that global variables are no longer used in v11. So in order to upgrade to v11 you will have to get rid of all the global variables anyway. It is best practice at this point to use local variables. This also does allow as you mentioned the proper use of both CPU.

 

David