Remotely Gauging Upstream Bufferbloat Delays

``Bufferbloat'' is the growth in buffer size that has led Internet
delays to occasionally exceed the light propagation delay from the Earth
to the Moon. Manufacturers have built in large buffers to prevent
losses on Wi-Fi, cable and ADSL links. But the combination of some links'
limited bandwidth with TCP's tendency to saturate that
bandwidth results in excessive queuing delays. In response, new
congestion control protocols such as BitTorrent's uTP/LEDBAT aim at
explicitly limiting the delay that they add over the bottleneck link.
This work proposes and validate a methodology to monitor the upstream
queuing delay experienced by remote hosts, both those using
LEDBAT, through LEDBAT's native one-way delay measurements, and
those using TCP (via the Time-stamp Option).