Re: [lwip-users] throughput statistics tracking

[David Empson]

"Tyrel Newton" <address@hidden> wrote:
> Has there ever been interest in integrating throughput statistics tracking 
> into lwIP at the netif level (or is there something available to do this)? 
> I know close to zero about SNMP so I apologize if this is something that 
> is provided by the SNMP layer.

It is. SNMP can count bytes and packets transmitted and received on each 
network interface.

> What I'm interested in is tracking (for example) the throughput for the
> past 60 seconds, mainly for debugging of performance purposes. I have
> written something to do this at the emac driver layer, but it seems like
> something that could easily be integrated at the netif layer and might be
> something that people using different platforms are interested in as well.
> The way I implemented it was basically counting total packet bytes
> transmitted and received for 60 one second intervals. The storage for
> these byte counts and the overhead of adding to the count is pretty 
> minimal.

You could do exactly the same thing with SNMP by sampling the counters every 
second and calculating the differences.

SNMP can access many other things, and has the advantage of a being a 
standard protocol which can be accessed across the network (which would of 
course interfere with bytes and packet counts for that network interface).

It does add quite a bit of overhead, so there may be benefit to having an 
optional simple byte/packet count which can only be accessed locally.