root -- [priority, best_effort, dregs]
    rate $DL

priority -- [expedited, interactive]
    rate 124kbit
    ceil $DL
    prio 1

best_effort -- [default, bulk]
    rate ($DL-124)kbit
    ceil $DL
    prio 2

expedited (TOS field 0xb8, detected VOIP)
    prio 1
    ceil $DL
    sfq

interactive (TOS delay bit, DFCS class 4 and up, user-defined ports, ACKs, etc.)
    prio 2
    ceil $DL
    sfq

default (TOS field 0x0 or TOS reliability bit, default)
    prio 1
    rate ($DL-124)*2/3 kbit
    ceil $DL
    sfq

bulk (TOS throughput bit, user-defined ports)
    prio 1
    rate ($DL-124)*1/3 kbit
    ceil $DL
    sfq

dregs (ipp2p, user-defined ports)
    prio 3
    rate 0
    ceil ($DL-124)kbit