tc-pfifo_fast(8) - phpMan

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PFIFO_FAST(8)                        Linux                       PFIFO_FAST(8)



NAME
       pfifo_fast - three-band first in, first out queue


DESCRIPTION
       pfifo_fast is the default qdisc of each interface.

       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.

       In this sense this qdisc is magic, and unlike other qdiscs.


ALGORITHM
       The algorithm is very similar to that of the classful tc-prio(8) qdisc.  pfifo_fast
       is like three tc-pfifo(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.

       Not all three bands are dequeued simultaneously - as long as lower bands have traf-
       fic, higher bands are never dequeued. This can be used  to  prioritize  interactive
       traffic or penalize 'lowest cost' traffic.

       Each  band can be txqueuelen packets long, as configured with ifconfig(8) or ip(8).
       Additional packets coming in are not enqueued but are instead dropped.

       See tc-prio(8) for complete details on how TOS bits are translated into bands.

PARAMETERS
       txqueuelen
              The length of the three bands depends on the interface txqueuelen, as speci-
              fied with ifconfig(8) or ip(8).


BUGS
       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.


SEE ALSO
       tc(8)


AUTHORS
       Alexey N. Kuznetsov, <kuznet AT ms2.ru>

       This manpage maintained by bert hubert <ahu AT ds9a.nl>





iproute2                        10 January 2002                  PFIFO_FAST(8)

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