[Bug 236716] net/ntopng: pfSense ntopng Port - Historical graph inaccurate

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236716

Guido Falsi <madpilot at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|ports-bugs at FreeBSD.org      |madpilot at FreeBSD.org
            Summary|pfSense ntopng Port -       |net/ntopng: pfSense ntopng
                   |Historical graph inaccurate |Port - Historical graph
                   |                            |inaccurate
                 CC|                            |madpilot at FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Guido Falsi <madpilot at FreeBSD.org> ---
I'm taking this as the maintainer of the ntopng port.

I'm not sure though how to address this. It looks like an ntopng problem, since
the graphs are generated by it.

Does not look like a porting problem but an upstream bug.

I'll try looking at it. Anyway it is important to note that historical data is
actually smoothed out, as you say, so a single peak, or many small peaks will
rarely show in the graph. If I remember correctly those graphs are generated
using rrdtool. That tool registers data for timeframes (let's say 5 minutes, or
1 day) and for each timeframe registers a minimum a maximum and an average
value. It can well be the graph is drawn using only the averages, while the
other data also uses the min/max values, which then would never show in the
graph.

It could be interesting to test if this happens with a vanilla FreeBSD box or a
a Linux box too.

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