How pathload works Pathload estimates the available bandwidth by sending packet trains at different rates and measuring the one-way-delay. It looks for increasing trends as an indication for congestion. INCREASINGNO TRENDGREY
First results Poor accuracy at low loads (or high available bitrates) –Max. clock granularity of traffic generator is 1 usec –Clock resolution is hard to achieve Tendency to get stuck in an ‘infinite’ loop –Derivation errors in internal variables –Wrong trend classification has big consequences This might be a big problem in real world situations where load conditions change. Question: what is the load generated by pathload ? Bad influence of bursty (on-off) cross traffic
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