NAME<\/a> pfifo_fast \u2212 three-band first in, first out queue<\/p>\n pfifo_fast is the default qdisc of each interface.<\/p>\n Whenever an interface is created, the pfifo_fast qdisc is automatically used as a queue. If another qdisc is attached, it preempts the default pfifo_fast, which automatically returns to function when an existing qdisc is detached.<\/p>\n In this sense this qdisc is magic, and unlike other qdiscs.<\/p>\n The algorithm is very similar to that of the classful tc-prio<\/b>(8) qdisc. pfifo_fast<\/b> is like three tc-pfifo<\/b>(8) queues side by side, where packets can be enqueued in any of the three bands based on their Type of Service bits or assigned priority.<\/p>\n Not all three bands are dequeued simultaneously – as long as lower bands have traffic, higher bands are never dequeued. This can be used to prioritize interactive traffic or penalize \u2019lowest cost\u2019 traffic.<\/p>\n Each band can be txqueuelen packets long, as configured with ifconfig<\/b>(8) or ip<\/b>(8). Additional packets coming in are not enqueued but are instead dropped.<\/p>\n See tc-prio<\/b>(8) for complete details on how TOS bits are translated into bands.<\/p>\n txqueuelen<\/p>\n The length of the three bands depends on the interface txqueuelen, as specified with ifconfig<\/b>(8) or ip<\/b>(8).<\/p>\n Does not maintain statistics and does not show up in tc qdisc ls. This is because it is the automatic default in the absence of a configured qdisc.<\/p>\n
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