QUESTION #2: How does CeroWrt use info gleaned from the link layer adaptation?

Specifically, the link layer adaptation all seem to be designed to compute the 
actual time it takes to transmit a packet, accounting for Ethernet & PPPoE 
header bytes, other overhead, and ATM 48-in-53 framing.

How does CeroWrt use this time calculation? Does it simply make sure that the 
target time doesn’t get too low for a particular flow’s queue? (I could imagine 
that a short packet over ATM would take 2x the (naive) expected/calculated time 
for a packet of that length, and that flow would be penalized. Is there more to 
it?)
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