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 pe-
nalize 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 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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