Spring 2000CS 46110 Metrikák Eredeti ARPANET metrika –measures number of packets enqueued on each link –took neither latency or bandwidth into consideration New ARPANET metric –stamp each incoming packet with its arrival time ( AT ) –record departure time ( DT ) –when link-level ACK arrives, compute Delay = (DT - AT) + Transmit + Latency –if timeout, reset DT to departure time for retransmission –link cost = average delay over some time period Fine Tuning –compressed dynamic range –replaced dynamic with link utilization
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