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Thrillseeker_12's avatar
Mar 17, 2015

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

 

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