Thanks for the pointers. As for the epistemological implications of to my concerns, I must admit that I find them a little bit frightening :)
After browsing some of the presentations, the relevant component for my problem seems to be the variability V. However, it is not clear to me how I can measure or infer it in my situation, i.e., if I cannot: 1) have any feedback on the user experience; 2) measure the time that elapses between when a time-sensitive application puts a message in a socket and when that message is actually sent by the node in a packet; 3) in the opposite direction, measure the time that elapses between when a packet arrives to the node and when the application receives the message contained in the packet. On which documents should I concentrate more to better understand this point? Thanks, Paolo Il giorno 27/apr/2015, alle ore 11:54, Neil Davies <[email protected]> ha scritto: > Paolo > > Yes, it is - there is a whole methodology for detecting this and associated > algebra for manipulation. It has been used at CERN, in various telcos and in > various large scale, real time distributed systems to relate end user > outcomes to the delay/loss characteristics of the network. > > Take a look at http://www.pnsol.com/publications.html, you may find > http://www.pnsol.com/public/PP-PNS-2009-02.pdf as a good starting point. > > Neil > > On 27 Apr 2015, at 10:48, Paolo Valente <[email protected]> wrote: > >> Hi, >> a network-monitoring company got curious about bufferbloat issues and asked >> me to investigate a little bit the following issue (quite interesting in my >> opinion). Is it possible to detect, from outside a node, if the node is >> bufferbloated? In particular, the only action allowed would be to observe >> the packets entering and leaving the node (plus, of course, their timing). >> >> If such a general problem is to hard or impossible to solve, do you think it >> is still possible at least to understand, for some type of application, if >> the application is experiencing a high latency because of bloated buffers >> inside the node? (As above, by just observing packet flows from outside the >> node.) >> >> Thanks, >> Paolo >> >> _______________________________________________ >> Bloat mailing list >> [email protected] >> https://lists.bufferbloat.net/listinfo/bloat > -- Paolo Valente Algogroup Dipartimento di Fisica, Informatica e Matematica Via Campi, 213/B 41125 Modena - Italy homepage: http://algogroup.unimore.it/people/paolo/ _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
