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Linux 2.6 - man page for tc-pfifo_fast (linux section 8)

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PFIFO_FAST(8)				      Linux				    PFIFO_FAST(8)

       pfifo_fast - three-band first in, first out queue

       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.

       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 traffic,
       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).  Addi-
       tional 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.

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

       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.


       Alexey N. Kuznetsov, <kuznet@ms2.inr.ac.ru>

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

iproute2				 10 January 2002			    PFIFO_FAST(8)
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