Why is there different latencies between Openshift host and docker container

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Issue

Why there is this noticeable difference in latency when executing curls from the OSE host system (approx. 30ms) and executing curls from within a docker container (approx. 55ms).
What is the additional latency expected to be imposed by OSE/SDN?

Environment

Openshift Enterprise
- 3.1.1

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