tc-pfifo(8) - phpMan

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PBFIFO(8)                            Linux                           PBFIFO(8)



NAME
       pfifo - Packet limited First In, First Out queue

       bfifo - Byte limited First In, First Out queue


SYNOPSIS
       tc qdisc ... add pfifo [ limit packets ]

       tc qdisc ... add bfifo [ limit bytes ]


DESCRIPTION
       The  pfifo  and bfifo qdiscs are unadorned First In, First Out queues. They are the
       simplest queues possible and therefore have  no  overhead.   pfifo  constrains  the
       queue size as measured in packets.  bfifo does so as measured in bytes.

       Like  all  non-default  qdiscs, they maintain statistics. This might be a reason to
       prefer pfifo or bfifo over the default.


ALGORITHM
       A list of packets is maintained, when a packet is enqueued it gets inserted at  the
       tail of a list. When a packet needs to be sent out to the network, it is taken from
       the head of the list.

       If the list is too long, no further packets are allowed on. This  is  called  'tail
       drop'.


PARAMETERS
       limit  Maximum  queue size. Specified in bytes for bfifo, in packets for pfifo. For
              pfifo, defaults to the interface txqueuelen, as specified  with  ifconfig(8)
              or ip(8).

              For bfifo, it defaults to the txqueuelen multiplied by the interface MTU.


OUTPUT
       The output of tc -s qdisc ls contains the limit, either in packets or in bytes, and
       the number of bytes and packets actually sent. An unsent and  dropped  packet  only
       appears between braces and is not counted as 'Sent'.

       In  this  example,  the queue length is 100 packets, 45894 bytes were sent over 681
       packets.  No packets were dropped, and as the pfifo queue does not slow down  pack-
       ets, there were also no overlimits:

       # tc -s qdisc ls dev eth0
       qdisc pfifo 8001: dev eth0 limit 100p
        Sent 45894 bytes 681 pkts (dropped 0, overlimits 0)

       If a backlog occurs, this is displayed as well.

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                      PBFIFO(8)

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