Saturday I was in my favourite grocery store, standing in the line, browsing the net on my phone. I read Vadim Tkachenko‘s blog post about Measuring Percona Server Docker CPU/network overhead and his findings were the opposite than mine – he didn’t found any measurable difference. Reading his post, he did found huge impact in networking which I didn’t checked, so I was re-run my checks again, but now with paying attention for network configuration.
I won’t lingering this more: he’s correct, I was wrong. After I start to use the host’s network directly – the performance degradation went away.
Yay, for Vladim!