After upgrade to 11.6 HF4 mysqld causes high cpu usage

Hi devcentral community,

 

Just wondering if somebody else noticed the same behaviour after upgrade to 11.6 HF4 (LTM/APM/ASM).

 

After upgrade to 11.6 HF4 on a BIG-IP 2000s cluster (from 11.4.1 HF4) average cpu consumption is much more higher (active and standby unit!). After some investigation I found out that the "mysqld" process consumes up to 100% of one cpu-core in 5min intervals, only for 3-5 secs. On a heavy loaded system this could have serious performance impacts of course. See graphs below:

 

CPU 30 days graph:

 

CPU 7 days graph

 

CPU 3 hours graph

 

Actually all services are running stable with 11.6 HF4 far, but of course CPU usage statistics are approx. 20% higher with 11.6 HF4 than before upgrade!

 

Both cluster members are affected and I was also able to reproduce the issue on my lab environment (vmware-esx).

 

I tried to deactivate AVR, but the issue remains with and without AVR!

 

Does anybody else noticed this higher cpu usage after upgrade to 11.6 HF4 with LTM/APM/ASM?

 

Thanks a lot Regards Lukas