[collectd] Configure reporting interval on network plugin

[Joel Serrano]

Hi Marc,

We are collecting data every 10 seconds, and its being sent every 2-3
minutes (that must be how long it takes to fill the buffer).

We are not losing metrics as in influx we can see the correct timestamp of
each event with a 10 second gap between them. We only wanted to report the
metrics faster, so per your answer the way would be to decrease the buffer
so the metrcis are sent every more often.

I'm going to update the github issue with this info.

Thanks for your help!

Now everything is clear.

Best regards,
Joel.

On Tue, Feb 16, 2016 at 8:39 AM, Marc Fournier <marc.fournier at camptocamp.com
> wrote:

> Excerpts from Joel Serrano's message of 2016-02-15 20:41:58 -0800:
> >
> > Has anyone successfully configured the network plugin in collectd to send
> > metrics every X seconds? (like 10 seconds).
>
> You can't control how frequently collected data is flushed to the write
> target(s). Only how frequently read targets are probed.
>
> In the case of the network plugin, the data gets flushed once its buffer
> is full, which size defaults to 1.5kB. Are you collecting very little
> data with a relatively high read interval ? If not you might want to
> fire tcpdump to check you aren't loosing packets (remember the protocol
> is UDP-based).
>
> Note that the values dispatched include the collection time timestamp.
> So even if there is some delay before they reach their final
> destination, they should be stored with the correct time reference.
>
> Cheers,
> Marc
>
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