Re: [B.A.T.M.A.N.] batctl bw performance

Antonio Quartulli
2013-06-07T13:57:13Z

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Hi Gabriel,

thank you for your logs

On Fri, Jun 07, 2013 at 10:49:10AM -0300, Gabriel Tolón wrote:
> >
> > Hello Gabriel,
> > there is a lot of noise because you are also generating traffic on the network.
> > However I can see the ICMP Echo Request and then an Echo Reply, therefore the
> > two nodes seem to be exchanging ICMP packets correctly.
> >
> > I'm checking again to try to understand what went wrong.
> >
> > Meanwhile, can you please report the output of
> > "batctl l"
> > during a bw test after having set the bw_meter log level by running
> > "batctl ll bwm" ?
> >
> > To get the exact log of one test, you can first run batctl l (this will print
> > all the past log), then you run the test and then you run batctl l again to
> > obtain the interesting log. Please upload it on pastebin too.
> >
> > Thanks a lot!
> >
>
> Sure, here they are:
>
> http://pastebin.com/fLu9hsyt
>

From this log I can see that the protocol is entering Fast Retransmit many times
and this happens due to reordering or small losses (the latter option is more
realistic on a single hop network - but is it really one hop? I never asked).

The other strange thing I see is the final SRTT value which is 260ms and looks
pretty high. Is there anything else going on the network (other traffic or..)?

Cheers,