[collectd] Collectd plugin for Madwifi and some questions

Ondrej Zajicek santiago at crfreenet.org
Thu Jul 16 10:17:11 CEST 2009

On Thu, Jul 16, 2009 at 09:13:43AM +0200, Sebastian Harl wrote:
> > > 3) Besides of these counters, there are RSSI (received signal strength
> > > indicator) for each station, but this value is updated only when a
> > > packet is received from that station. I think that RSSI value should
> > > not be submitted if there is no received packed from last RSSI
> > > submission. It is correct to do such irregular data submission?
> > 
> > Yes, that'd be okay by me, but it may cause problems with RRDtool's
> > consolidation.
> ... which might confuse users. Anyway, imho, there are two ways to look
> at this situation: a) if the value has not been updated, it did not
> change, so the old value should still be used or b) we don't know the
> RSSI if the value has not been updated (the important point being that
> RSSI _is_ subject to change in the meantime), so the value should be
> considered unknown, i.e. it should not be submitted. Are you able to
> tell if the value has been updated or do you simply get the same value
> no matter if it happened to stay the same or if no packet has been
> received?

Yes, i can check rx sequence numbers to know that no packed was received.

> What do you think about submitting the latest RSSI value (in case it did
> not change in the meantime) for x (something like 3-5 should be fine)
> intervals. This would make sure that we don't end up having unknown data
> in the (e.g.) RRD files but still honors the fact that there might be
> intervals with unknown data.

That is a good idea, i will do that.

Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."
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