Forum Discussion

dhubick's avatar
dhubick
Icon for Altocumulus rankAltocumulus
May 04, 2022

High Server CPU after 16.2.1 Upgrade

 Our SysAdmin team has reported a sharp increase in CPU usage on the nodes in our ltm pools after upgrading to BIG-IP 16.2.1. from 14.2.1. The servers are maintained by a different team, but I ...
application delivery
Nikoolayy1's avatar
Nikoolayy1
Icon for MVP rankMVP

Better check from the servers whuch process causes the issue not on the F5. The issue could be that F5 now uses more complex SSL ciphers or something needs to be changed in the server side TCP profile on the F5 device to optimize the traffic.

https://support.f5.com/csp/article/K50411377

https://support.f5.com/csp/article/K72605755

 

 

Still check the F5 LTM logs for some new errors with the VIP/nodes/pools/poolmembers and also see the f5 interfaces for some errors just in case.

dhubick's avatar
dhubick
Icon for Altocumulus rankAltocumulus
May 06, 2022

Best I can tell, it was using "ECDHE-RSA-AES128-GCM-SHA256" before and after upgrade.

Thanks for the leads though. Still checking into TCP profiles.