We are in a process of migration CentOS 5.x -> CenstOS 6.x, we are using Percona 5.6.26 release and I found interesting behaviour:
CentOS 6.x based systems are swapping even with 4 GB buffer pool size and 32GB memory =(.
Most of CentOS 5.x based systems are not using SWAP at all.
I tried to dig into this problem and found some articles about NUMA memory allocation, but: CentOS 5.x and CentOS 6.x are NUMA enabled systems. What is the difference?
I have not tried to fix at this moment and as I understood [B]
Could someone explain the difference of SWAP policy in CentOS 5/6 + Percona?
/proc/sys/vm/swappiness is 60 by default.