Adding upstream version 4.22.0.upstream/4.22.0

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

1 files changed, 171 insertions, 0 deletions

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+.TH HTB 8 "10 January 2002" "iproute2" "Linux"
+.SH NAME
+HTB \- Hierarchy Token Bucket
+.SH SYNOPSIS
+.B tc qdisc ... dev
+dev
+.B  ( parent
+classid
+.B | root) [ handle
+major:
+.B ] htb [ default
+minor-id
+.B ] [ r2q
+divisor
+.B ] [ offload ]
+
+.B tc class ... dev
+dev
+.B parent
+major:[minor]
+.B [ classid
+major:minor
+.B ] htb rate
+rate
+.B [ ceil
+rate
+.B ] burst
+bytes
+.B [ cburst
+bytes
+.B ] [ prio
+priority
+.B ] [ quantum
+bytes
+.B ]
+
+.SH DESCRIPTION
+HTB allows  control of the outbound bandwidth on a given link.
+It allows simulating simulating several slower links and to send different
+kinds of traffic on different simulated links. In both cases, you have
+to specify how to divide the physical link into simulated links and
+how to decide which simulated link to use for a given packet to be sent.
+
+HTB shapes traffic based on the Token Bucket Filter algorithm
+which does not depend on interface characteristics and so does not need to
+know the underlying bandwidth of the outgoing interface.
+
+.SH SHAPING ALGORITHM
+Shaping works as documented in
+.B tc-tbf (8).
+
+.SH CLASSIFICATION
+Within the one HTB instance many classes may exist. Each of these classes
+contains another qdisc, by default
+.BR tc-pfifo (8).
+
+When enqueueing a packet, HTB starts at the root and uses various methods to
+determine which class should receive the data.
+
+In the absence of uncommon configuration options, the process is rather easy.
+At each node we look for an instruction, and then go to the class the
+instruction refers us to. If the class found is a barren leaf-node (without
+children), we enqueue the packet there. If it is not yet a leaf node, we do
+the whole thing over again starting from that node.
+
+The following actions are performed, in order at each node we visit, until one
+sends us to another node, or terminates the process.
+.TP
+(i)
+Consult filters attached to the class. If sent to a leafnode, we are done.
+Otherwise, restart.
+.TP
+(ii)
+If none of the above returned with an instruction, enqueue at this node.
+.P
+This algorithm makes sure that a packet always ends up somewhere, even while
+you are busy building your configuration.
+
+.SH LINK SHARING ALGORITHM
+FIXME
+
+.SH QDISC
+The root of a HTB qdisc class tree has the following parameters:
+
+.TP
+parent major:minor | root
+This mandatory parameter determines the place of the HTB instance, either at the
+.B root
+of an interface or within an existing class.
+.TP
+handle major:
+Like all other qdiscs, the HTB can be assigned a handle. Should consist only
+of a major number, followed by a colon. Optional, but very useful if classes
+will be generated within this qdisc.
+.TP
+default minor-id
+Unclassified traffic gets sent to the class with this minor-id.
+.TP
+r2q divisor
+Divisor used to calculate
+.B quantum
+values for classes.  Classes divide
+.B rate
+by this number.  Default value is 10.
+.TP
+offload
+Offload the HTB algorithm to hardware (requires driver and device support).
+
+.SH CLASSES
+Classes have a host of parameters to configure their operation.
+
+.TP
+parent major:minor
+Place of this class within the hierarchy. If attached directly to a qdisc
+and not to another class, minor can be omitted. Mandatory.
+.TP
+classid major:minor
+Like qdiscs, classes can be named. The major number must be equal to the
+major number of the qdisc to which it belongs. Optional, but needed if this
+class is going to have children.
+.TP
+prio priority
+In the round-robin process, classes with the lowest priority field are tried
+for packets first.
+
+.TP
+rate rate
+Maximum rate this class and all its children are guaranteed. Mandatory.
+
+.TP
+ceil rate
+Maximum rate at which a class can send, if its parent has bandwidth to spare.
+Defaults to the configured rate, which implies no borrowing
+
+.TP
+burst bytes
+Amount of bytes that can be burst at
+.B ceil
+speed, in excess of the configured
+.B rate.
+Should be at least as high as the highest burst of all children.
+
+.TP
+cburst bytes
+Amount of bytes that can be burst at 'infinite' speed, in other words, as fast
+as the interface can transmit them. For perfect evening out, should be equal to at most one average
+packet. Should be at least as high as the highest cburst of all children.
+
+.TP
+quantum bytes
+Number of bytes to serve from this class before the scheduler moves to the next class.
+Default value is
+.B rate
+divided by the qdisc
+.B r2q
+parameter.  If specified,
+.B r2q
+is ignored.
+
+.SH NOTES
+Due to Unix timing constraints, the maximum ceil rate is not infinite and may in fact be quite low. On Intel,
+there are 100 timer events per second, the maximum rate is that rate at which 'burst' bytes are sent each timer tick.
+From this, the minimum burst size for a specified rate can be calculated. For i386, a 10mbit rate requires a 12 kilobyte
+burst as 100*12kb*8 equals 10mbit.
+
+.SH SEE ALSO
+.BR tc (8)
+.P
+HTB website: http://luxik.cdi.cz/~devik/qos/htb/
+.SH AUTHOR
+Martin Devera <devik@cdi.cz>. This manpage maintained by bert hubert <ahu@ds9a.nl>