  The number of applications running in the cloud has dramatically increased in
the past decade as well as the number of users accessing them. Data centres
resources, architectures and conditions define the performance of the
applications running on them. One of the main measures of the network
efficiency is the latency, which can have a huge effect on resources
utilisation, power consumption and the overall performance. In this paper, the
performance of a fog network is evaluated by measuring the latency while
running a facial recognition software. The network consists of two processing
cells, a core network and a PON cell. The results show how network latency is
affected by running the facial recognition software in the end-to-end network
setup introduced in this paper.
