Hi,

I believe you need to set the step size to something bigger:
from "run-flent --help"
-s STEP_SIZE, --step-size STEP_SIZE
                        Measurement data point step size.

For a slow link there are simply no data from netperf for a given "sampling" point and hence you get the intermittent plots. As far as I know there is unfortunately no way to specify the step size independent for both directions, so for non-choppy plots in your slow direction you will also get less time resolution in your fast direction...

Hope that helps




> On Jul 31, 2017, at 19:36, Emmanuel Blot <eblot.ml@gmail.com> wrote:
> 
> Hi all,
> 
> I’m a new flent user.
> 
> I’m trying to check my SQM settings on OpenWRT against bufferbloat.
> 
> For some reason, the TCP download and ping graphs for RRUL sessions
> give sensible results, whereas the TCP upload is broken into very
> small segments (even closer to dots actually), see the attached
> sample.
> 
> What am I doing wrong ?
> 
> command line: flent rrul -p all_scaled -l 60 -H host -o output.png
> 
> $ flent --version
> Flent v1.0.1.
> Running on Python 3.5.2 (default, Oct 11 2016, 04:59:56)  [GCC 4.2.1
> Compatible Apple LLVM 8.0.0 (clang-800.0.38)].
> Using matplotlib version 2.0.1 on numpy 1.12.1.
> Using PyQt5 version 5.9.
> 
> 
> Thanks,
> Manu.
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