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TC(8)                                         Linux                                         TC(8)

NAME
       choke - choose and keep scheduler

SYNOPSIS
       tc qdisc ... choke limit packets min packets max packets avpkt bytes burst packets [ ecn ]
       [ bandwidth rate ] probability chance

DESCRIPTION
       CHOKe (CHOose and Keep for responsive flows, CHOose and Kill for unresponsive flows) is  a
       classless  qdisc  designed  to both identify and penalize flows that monopolize the queue.
       CHOKe is a variation of RED, and the configuration is similar to RED.

ALGORITHM
       Once the queue hits a certain average length, a random packet is drawn from the queue.  If
       both  the  to-be-queued  and  the  drawn  packet belong to the same flow, both packets are
       dropped. Otherwise, if the queue length is still below the maximum length, the new  packet
       has  a  configurable chance of being marked (which may mean dropped).  If the queue length
       exceeds max, the new packet will always be marked  (or  dropped).   If  the  queue  length
       exceeds limit, the new packet is always dropped.

       The marking probability computation is the same as used by the RED qdisc.

PARAMETERS
       The  parameters  are  the same as for RED, except that RED uses bytes whereas choke counts
       packets. See tc-red(8) for a description.

SOURCE
       o      R. Pan, B. Prabhakar, and K. Psounis, "CHOKe, A Stateless Active  Queue  Management
              Scheme for Approximating Fair Bandwidth Allocation", IEEE INFOCOM, 2000.

       o      A. Tang, J. Wang, S. Low, "Understanding CHOKe: Throughput and Spatial Characteris‐
              tics", IEEE/ACM Transactions on Networking, 2004

SEE ALSO
       tc(8), tc-red(8)

AUTHOR
       sched_choke was contributed by Stephen Hemminger.

iproute2                                   August 2011                                      TC(8)

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