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PBFIFO !!!PBFIFO NAME SYNOPSIS DESCRIPTION ALGORITHM PARAMETERS OUTPUT SEE ALSO AUTHORS ---- !!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 packets, 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, This manpage maintained by bert hubert ----
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