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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	 unre‐
       sponsive	 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)
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