[Commotion-announce] Very bad ETX

[Josh Harle]

Hi Aaron,

Thanks for your thoughts with this.  My main test setup was just 3 picos,
trying various distances from each (20-200m), and various tx powers.  In
all cases the mesh connections were reported as very good, until more than
one AP was turned on in the the network.  This was even when the two APs
were far enough away that they could not see each other.  Having a single
AP on the network didn't cause any problems at all.

For me this seems to indicate it's not just a radio-sharing issue, since
the single mesh node with AP turned on is very happy.



Kind Regards,

Dr Josh Harle
____________________
http://joshharle.com
http://tacticalspace.org
ph: +61 (0)491 155 985

On 6 March 2015 at 20:03, L. Aaron Kaplan <aaron at lo-res.org> wrote:

>
> On Feb 27, 2015, at 6:22 AM, Josh Harle <josh.harle at gmail.com> wrote:
>
> > With distance the ETX does not improve.  I moved it in stages up to
> about 20 metres away, and the ETX has gone up to 7.9.
> >
>
> Another thing to consider: ETX is just a synthetic metric / measurement
> which actually captures packet loss.
> So, theoretically there could be way more effects involved than just the
> short distance (which for sure will be a problem):
>   * faulty pigtail cables
>   * faulty antennas
>   * faulty radio
>   * bugs in the software version which cause packet loss
>   etc.
>
> Probably one trick would be to nail down the root cause and then see if a
> change there results in the desired outcome.
>
> Best,
> a.
>
> > Kind Regards,
> >
> > Dr Josh Harle
> > ____________________
> > http://joshharle.com
> > http://tacticalspace.org
> > ph: +61 (0)409 771 163
> >
> > On 27 February 2015 at 15:37, Adam Longwill <adam.longwill at gmail.com>
> wrote:
> > Try moving them much farther away from each other. I have seen that
> problem too and its because they may be too close. Andy Gunn informed me of
> the phenomenon.
> >
> > On 26 Feb 2015 23:35, "Josh Harle" <josh.harle at gmail.com> wrote:
> > Hi All,
> >
> > I had assumed that my very bad ETX was due to a problem with tx power,
> but I think I was wrong.  I currently have two Picostation M2HPs 3 metres
> from each other getting an ETX of between 4 and 6.
> >
> > Something seems to be wrong there!
> >
> > Is there some obvious troubleshooting I could be doing?
> >
> > What do people think the problem is?
> >
> > Kind Regards,
> >
> > Dr Josh Harle
> > ____________________
> > http://joshharle.com
> > http://tacticalspace.org
> > ph: +61 (0)409 771 163
> >
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