Forum Discussion
when i check top command i found tmm.0 is very high
Just doing a top at a random time may not help you. TMM being high could be as you have too much traffic for your F5 model. Check this and run the script at a time window when you have seen the cpu to jump to confirm if the tmm is the only one that jumps and for other issues:
https://support.f5.com/csp/article/K40472403
You may also check this great community article:
https://devcentral.f5.com/s/articles/Troubleshooting-High-CPU-Utilisation-on-F5-boxes
If you see tha only the tmm is the issue from expiriance you may check the /var/log/ltm for many irule logs, ssl decrytions failed handshakes, TCP RST debug variables enabled etc. In other words to see what can you do to optimize the the device by resolving issues and stoping enabled debugs or irule logs. Also if you have the ASM module pload the qkview to f5 ihealth and under the tab Securiry review the CPU just for the ASM as the ASM causes many jumps. If it was CP leakage the CPU should stay high all the time so I think it is utilization. Also review the /var/log/kern log as it may have also helpfull info.