Dear all, 

After some time in silence on the IPPM list, I like to make some comments here. As we presented in the draft-ietf-ippm-route-00 (now the RFC9198), the main problem is the traffic follows heavy-tailed distributions when it is seen from the end-to-end points: the origin of most of the issues in that video. Therefore, treating it as parametric distribution is not possible, unless you are dealing with a complex distribution like the Stable distribution:

	• B. Mandelbrot, “New methods in statistical economics,” Journal of political economy, vol. 71, no. 5, pp. 421–440, 1963.

	•  ——, “The variation of certain speculative prices,” The journal of business, vol. 36, no. 4, pp. 394–419, 1963.

(and so it will be extremely complex a high computing demands.)
This is why we propose to use quartiles to characterize delays in the RFC9198. Then, I am doing some research to understand how the delay can change with network load, using the quartiles. 
I attach some measurements done during the pandemic, showing the congestion as a function of the time. 


Best,

	Ignacio

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Dr. Ing. José Ignacio Alvarez-Hamelin
CONICET and Facultad de Ingeniería, Universidad de Buenos Aires
Av. Paseo Colón 850 - C1063ACV - Buenos Aires - Argentina
+54 (11) 5285 0716 / 5285 0705
e-mail: ihameli@cnet.fi.uba.ar
web: http://cnet.fi.uba.ar/ignacio.alvarez-hamelin/
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