tc-choke(8) - man - phpman

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  con‐
       figurable  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 pack‐
       ets. 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)