Re: [homenet] ISIS wifi testing

Dave Taht <dave.taht@gmail.com> Fri, 16 October 2015 14:07 UTC

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Date: Fri, 16 Oct 2015 16:07:26 +0200
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From: Dave Taht <dave.taht@gmail.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
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Cc: HOMENET <homenet@ietf.org>
Subject: Re: [homenet] ISIS wifi testing
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flent.org, dude, has tons of tests, lovely graphs, and so on.The rrul
test was the one intended for 802.11e in the first place. the
rtt_fairness tests are good for testing what happens when routing
happens.

On Fri, Oct 16, 2015 at 3:59 PM, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
>
> Hello.
>
> I have spent a large chunk of today doing wifi testing with the quagga
> implementation of homenet isis.
> https://plus.google.com/110006881111138232905/posts/UwYS9h2n7eM
>
> I have been using iperf3 sending 2 megabit/s of UDP:
>
> iperf3 -l 1400 -R -u -b 10M -t 6000 -c 10.0.58.140
>
> The setup is that I set up a WDR4900 with one connection to the Internet
> (not really relevant), and one wired connection to an Ubuntu machine. I then
> set up two additional WDR4900 on my sons tricycle, plus a laptop.
>
>           +----W1-----+R1
> C1 +----+R3            +
>           +            +
>           +----W0-----+R2+---+C2
>
> C1-R3, R2-C2, R1-R2 are wired connections.
>
> W0 is 5GHz radio.
> W1 is 2.4GHz radio.
>
> I'm running all radios at 10mW.
>
> If I position the setup just outside the room the R3 is located in, W0 has
> better SNR and lower metric, and is thus used. As I move further away from
> R3, W1 will start to get better SNR compared to W0, as W0 is degrading more
> per physical distance compared to W1.
>
> Generally I only see very little packet loss as long as at least one of the
> radios has decent radio performance. I can go back and forth between W0 and
> W1 being the best radio with usually just 0-10 packets lost out of 893
> packets per second, usually it's 0-3.
>
> I spent part of the day doing testing between laptop and a VM on my normal
> laptop, but I just in the past hour discovered that this VM causes packet
> loss. I replaced it with another computer and now all the spurious packet
> loss I was seeing before even using cable, is gone.
>
> So this is a very simple setup, and it's also loop-free at least in one
> direction, traffic R3->C2 is loop-free either via R2 and R1, whereas R2->C1
> can loop at R1 until R1 has converged its routing table due to a change
> received from R2.
>
> Also, the above UDP test is only in one direction. How should I record the
> testing, should I have two sessions, one in each direction, and just log the
> results to file, so we see per-second result of packets sent/received and
> packet delay variance (iperf3 will give a value there).
>
> I mean, from setting up everything and then just powering it up and moving
> it around, it basically "just works". I can move the rig out of coverage,
> it'll connect and start working as soon as the radios are up, and when there
> is a lower SNR radio, it'll move to it without any major packet loss.
>
> I could for instance make a screen shot video of 10 minutes of testing with
> all the values scrolling, on the screen including the homenet web "bubble"
> diagram in the corner somewhere, and "ip monitor" running so the metrics can
> be seen continously.
>
> Suggestions for tests greatly appreciated.
>
> --
> Mikael Abrahamsson    email: swmike@swm.pp.se
>
> _______________________________________________
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> homenet@ietf.org
> https://www.ietf.org/mailman/listinfo/homenet



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Dave Täht
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