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    Command:

    tc-pfifo_fast

    
    
    
    

    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  Ser-
           vice 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 ifcon-
           fig(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  txqueue-
                  len, as specified 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@ms2.inr.ac.ru>
    
           This manpage maintained by bert hubert <ahu@ds9a.nl>
    
    
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