Hello everyone,
Actually we had a lot of network issues between our nodes on AWS (nodes are on CentOS 7), looking into kernel messages I got several messages like :
xennet: skb rides the rocket: 19 slots
xennet: skb rides the rocket: 19 slots
xennet: skb rides the rocket: 19 slots
This bug is referred here :
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1317811
Fix: Disable scatter-gather on your network card
sudo ethtool -K eth0 sg off
Since, I don't have any other problem and our cluster is super healthy !