[Bloat] Detecting bufferbloat from outside a node

[Neil Davies]

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 <paolo.valente at unimore.it> 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
> 
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