Sketching the delay
Josep Sanjuàs-Cuxart, Pere Barlet‐Ros, Nick G. Duffield, Ramana Rao Kompella · 2011
Packet delay is a crucial performance metric for real-time, network-based applications. Obtaining per-flow delay measurements is particularly important to network operators, but is computationally challenging in high-speed links. Recently, passive delay measurement techniques have been proposed that outperform traditional active probing in terms of accuracy and network overhead. However, such techniques rely on the empirical observation that packet delays across different flows are temporally correlated, an assumption that is not met in presence of traffic prioritization, load balancing policies, or due to intricacies of the switch fabric.