The big thing to take away from this is not "docker causes a performance change", it's that "there is some way to configure docker that affects performance". Obviously the expected behavior is that docker should have marginal performance impact, and any deviation from that is undesirable.
The numbers showing here are about what I would expect if something in the storage stack is doing more caching than normal. This likely has hidden costs, either in memory usage or robustness. It's worth digging down to find out what is happening, and how to validate docker configurations.
The numbers showing here are about what I would expect if something in the storage stack is doing more caching than normal. This likely has hidden costs, either in memory usage or robustness. It's worth digging down to find out what is happening, and how to validate docker configurations.