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tc-choke(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 Characteristics", IEEE/ACM Transactions  on  Networking,
          2004

SEE ALSO

   tc(8), tc-red(8)

AUTHOR

   sched_choke was contributed by Stephen Hemminger.



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