Understanding ntop throughput figures

[snapshot]

Anyone use ntop to monitor network usage able to explain the following?

If I look at the graph for Throughput 1 see about 1.5 Mbps. If I click on this to drill down the top send/receive between servers is about 50 Mbps. I don't see how these figures add up - any suggestions?

Thanks in advance

 

[ericbrunson]

I think it's an artifact of the averaging of traffic and the non-continuous time slices.

 

[snapshot]

Thanks but I don't understand! Is the throughput I'm getting 1.5 Mbps or 50 Mbps - We are backing up over the network, the backup is slow so I'm trying to establish if the network is the bottleneck. I'm guessing not as it's a 10/100 card so even at 50Mbps it's only 50% utilisation.

 

[ericbrunson]

Ntop does not show you instantaneous network load, it shows you averages. Ntop is not the tool you want to use to do what you need.