Re: [Starlink] plotting all the data

[Nick Buraglio <buraglio@forwardingplane.net>]

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This is much more common in the high performance computing and networking
space (i.e. perfsonar, TWAMP, and OWAMP). I have also been pushing "gather
and store all the data" for ....since I was an engineer working on the
Teragrid (which is where I first saw Matt's MTU talk around 2002 or 03,
BTW).  =)
High fidelity plots of everything that can be gathered is laborious to
curate but is invaluable for so many reasons. Now we just need a way to
make it happen everywhere for everyone in a way that's easy.

nb


On Thu, Jun 17, 2021 at 8:57 AM Dave Taht <davet@teklibre.net> wrote:

> Capturing and plotting *all* the data is often revealing.
>
> Sometimes plotting the data you are discarding (for what seems like sane
> reasons) is quite revealing.  Saw this on slashdot this morning, it’s
> good...
>
>
> https://www.newyorker.com/magazine/2021/06/21/when-graphs-are-a-matter-of-life-and-death
>
> In the bufferbloat effort I’ve fought time and time again for folk to stop
> throwing out data above the 95 percentile, and at the very least plot
> everything they threw out to find patterns...
>
> dslreports’ graphing tools, for example, throws out a ton of “outliers" …
> and the only reason why there is no data past 4 sec here, is that the test
> doesn’t run long enough.
>
> http://www.dslreports.com/speedtest/results/bufferbloat?up=1
>
> (been trying to get ahold of someone over there to buy their raw data for
> years now. They have the biggest - 8 years worth - collection)
>
> mlabs has a similar data reduction issue that they haven’t got around to
> fixing.
>
> And more recently we encountered a smoothing problem in wireshark that
> made a halt in packet processing look more like a normal tcp cwnd cut….
>
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