Template:Networking rutos manual traffic shaping

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Summary

Traffic Shaping is a bandwidth management technique used on computer networks which delays some or all datagrams to bring them into compliance with a desired traffic profile. Traffic Shaping is used to optimize or guarantee performance, improve latency, or increase usable bandwidth for some kinds of packets by delaying other kinds.

This manual page provides an overview of the Traffic Shaping pages in {{{name}}} devices.

If you're having trouble finding this page or some of the parameters described here on your device's WebUI, you should turn on "Advanced WebUI" mode. You can do that by clicking the "Advanced" button, located at the top of the WebUI.

SQM

The SQM page is used to set up Smart Queue Management (SQM) instances which can limit the download and upload speeds of selected network interfaces.

Note: SQM is additional software that can be installed from the Services → [[{{{name}}} Package Manager|Package Manager]] page.

The Smart Queue Management section contains a list of existing SQM instances and can be used manage them (edit/delete/enable/disable). By default the list is empty:

To add a new instance and begin editing, look below to the Add New Instance section and:

  1. enter a custom name in the 'Name' field;
  2. click the 'Add' button;
  3. configuration window will open automatically.

Refer to the sections below for information on editing SQM instances.

Basic Settings

The Basic Settings section is used to set download and upload speed limits for a selected network interface.

Field Value Description
Enabled off | on; default: off Turns the SQM configuration on or off.
Interface name network interface; default: br-lan (lan) Selects to which interface this SQM configuration will apply. Additional note: consider reading the [[{{{name}}}__QoS#Additional_notes|Additional notes]] section before limiting speeds on selected interfaces.
Download speed (kbit/s) integer [0..9999999999999999]; default: none Limits the download speed (ingress) of the selected interface to the value specified in this field.
Upload speed (kbit/s) integer [0..9999999999999999]; default: none Limits the upload speed (egress) of the selected interface to the value specified in this field.

Advanced Settings

The Advanced Settings section describes the internal logic of the SQM configuration.

Field Value Description
Queuing disciplines usable on this system cake | fq_codel; default: cake Queue management logic type. Look to the row below for detailed information.
Queue setup script layer_cake.qos | piece_of_cake.qos | simple.qos | simplest.qos | simplest_tbf.qos; default: piece_of_cake.qos Describes the queue management logic.
  • cake
    • layer_cake.qos - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. This exercises cake's diffserv profile(s) as different "layers" of priority.
    • piece_of_cake.qos - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. It just does not come any simpler than this, in other words it truly is a "piece of cake".
  • fq_codel
    • simple.qos - BW-limited three-tier prioritisation scheme with your qdisc on each queue.
    • simplest.qos - simplest possible configuration: HTB rate limiter with your qdisc attached.
    • simplest_tbf.qos - simplest possible configuration (TBF): TBF rate limiter with your qdisc attached. TBF may give better performance than HTB on some architectures.

Additional notes

Please consider that limiting the speed of certain interfaces may limit the speed of other interfaces as well. For example, if you limit the download and upload speeds of the default LAN interface (br-lan) to 50 000 kbps (50 Mbps) this will affect the speeds between:

  • Ethernet LAN machines (including the device)
  • Ethernet LAN machines and WAN*

* Since LAN machines communicate with WAN servers over the device which is also considered a LAN machine, LAN-to-WAN and WAN-to-LAN speeds are also affected.


The table below demonstrates speed changes between some of the main default network interfaces if br-lan speed is set to 50 Mbps.

Ethernet LAN Ethernet WAN Mobile WAN
Ethernet LAN 50 50 50
Ethernet WAN 50 unchanged unchanged
Mobile WAN 50 unchanged unchanged

Changing the speeds of other network interfaces may also affect more than one interface. However, the Ethernet LAN interface (br-lan) is related to most interfaces. Therefore, it is advised to limit the speeds of other interfaces in order to achieve more precise results (unless, of course, your goal to is to limit the speed of br-lan).

Another example to consider is limiting WAN interface speeds since that is the most widely implemented use case and affects less interface-to-interface relationships. For instance, limiting Ethernet WAN (eth1) speed to 50 Mbps would produce the following results:

Ethernet LAN Ethernet WAN Mobile WAN
Ethernet LAN unchanged 50 unchanged
Ethernet WAN 50 unchanged unchanged
Mobile WAN unchanged unchanged unchanged

Please take caution when using SQM to limit speeds in order to avoid unexpected results.

QoS

Note: QoS is additional software that can be installed from the Services → [[{{{name}}} Package Manager|Package Manager]] page.


[[Category:{{{name}}} Services section]]

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