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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 Approximat-
              ing Fair Bandwidth Allocation", IEEE INFOCOM, 2000.

       o      A. Tang, J. Wang, S. Low, "Understanding CHOKe: Throughput and Spatial Characteristics", IEEE/ACM Trans-
              actions on Networking, 2004


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


AUTHOR
       sched_choke was contributed by Stephen Hemminger.



iproute2                          August 2011                            TC(8)