Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.TH TC 8 "August 2011" "iproute2" "Linux"
+.SH NAME
+choke \- choose and keep scheduler
+.SH SYNOPSIS
+.B tc qdisc ... choke
+.B limit
+packets
+.B min
+packets
+.B max
+packets
+.B avpkt
+bytes
+.B burst
+packets
+.B [ ecn ] [ bandwidth
+rate
+.B ] probability
+chance
+
+.SH 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.
+
+.SH 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
+.BR max ,
+the new packet will always be marked (or dropped).
+If the queue length exceeds
+.BR limit ,
+the new packet is always dropped.
+
+The marking probability computation is the same as used by the RED qdisc.
+
+.SH PARAMETERS
+The parameters are the same as for RED, except that RED uses bytes whereas choke
+counts packets. See
+.BR tc-red (8)
+for a description.
+
+.SH SOURCE
+.TP
+o
+R. Pan, B. Prabhakar, and K. Psounis, "CHOKe, A Stateless
+Active Queue Management Scheme for Approximating Fair Bandwidth Allocation",
+IEEE INFOCOM, 2000.
+.TP
+o
+A. Tang, J. Wang, S. Low, "Understanding CHOKe: Throughput and Spatial
+Characteristics", IEEE/ACM Transactions on Networking, 2004
+
+.SH SEE ALSO
+.BR tc (8),
+.BR tc-red (8)
+
+.SH AUTHOR
+sched_choke was contributed by Stephen Hemminger.