grep 2000 and higher Post: 302385578

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tc-choke

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 config-
       urable 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 Alloca-
	      tion", IEEE INFOCOM, 2000.

       o      A. Tang, J. Wang, S. Low, "Understanding CHOKe: Throughput and Spatial Characteristics", 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)