In addition to those overheads it is common to have Instead of dropping a packet, fq_codel marks the packet with a congestion notification and passes it along to the receiver. I've had backups running for days at Bulk, vacuuming up all the spare upload capacity and it's completely unnoticeable (my network monitoring tells me there's an average 2mS increase in latency with peaks up to 4mS) For further reference I recommend to have a look at cake's source at Please note that as of middle 2018 cake, and cake only, will try to interpret any given overhead to be applied on top of Having dealt with host fairness we now need to deal with flow fairness & control. Explicit Congestion Notification (ECN) is a mechanism for notifying a sender that its packets are encountering congestion and that the sender should slow its packet delivery rate.
ISP requires VLAN 7 Tagging. egress: 19950 dual-srchost bridged-ptm ether-vlan nat mpu 72 Unless you are experimenting, you should use the default choice for the link layer adaptation mechanism.
A simple example/question: If I have two hosts one which starts 2 data streams and the other starts 8, then one host would get 80% of the bandwidth allocated to it and the other 20%.
Besteffort effectively ignores DSCP values, every packet is as important as the other and so just flow & host fairness come into play. The general rule for selecting the Link Layer Adaption is: ', well packet loss is a mechanism that
Note that most (but not all) ATM based links will exclude the FCS and hence probably do not require that setting. Display the log file created by the commands above:
At this point we have a reasonably fair system. You should also check the Since the majority of
As far as I can tell the more aggressive dropping in ingress-mode automatically scales with the load and hence it should make it possible to get away with configuring an ingress-mode rate closer to the true bottleneck-rate, and actually also get higher throughput if only few bulk flows are active. There are several components of overhead, the first comes from the basic transport technology itself: If you want to do the work, you can read the full description at the
As with other options in this tab, it is safe to leave them at their default. The commands below help to collect the information required to debug problems with SQM.
The shaper on egress doesn't count dropped packets, instead it looks in the queues to find a more worthy packet to occupy the space. ingress 78000 diffserv4 dual-dsthost bridged-ptm ether-vlan nat ingress Conceptually a traffic shaper will drop and/or delay packets in a way that the rate of packets leaving the shaper is smaller or equal to the configured shaper-rate.
20 Mbit/s download / 2.1 Mbit/s upload and 19 ms latency shown in the flent summary graph. (“flent” network measurement tool reports the overview as average of the 4 different traffic classes, so the total bandwidth was 4x the figures shown in the above table that shows “per-class” speed.
With this in mind, to get started, set the Link Layer Adaptation options based on your connection to the Internet. At some point in time, these advanced cake options may become better integrated into luci-app-sqm, but for the time being this is the way to make cake sing and dance… This discussion assumes SQM is instantiated on an interface that directly faces the internet/This website uses cookies.
The default values described below work quite well for most situations.
This situation can arise when using a router that uses one of its switch ports as the They include: As of middle of 2018 sqm-scripts will try to evaluate tcMPU for cake also.
ingress: 78000 bridged-ptm ether-vlan mpu 72 ingress The “luci-app-sqm” package of OpenWrt/LEDE solves the problem of Bufferbloat.
But what if I have some types of traffic that are less or more important than others? The steps above will control latency well without additional effort. In essence CAKE prevents the queue building up and ensures fair access by using a variation of codel to control delay (latency) on individual flows.
Installing the SQM Bufferbloat Packages in OpenWrt. The algorithm cannot automatically adapt to network conditions on DSL, cable modems or GPON without any settings.
The easiest way to do this is to run the DSLReports Speedtest ( Install the luci-app-sqm package in OpenWrt BB or CC. This is only really relevant for egress traffic and for asymmetric links. CAKE also has a means of fair sharing bandwidth amongst hosts. It causes bad performance for voice and video conversations, causes gamers to lag out, and generally makes people say, “The Internet is slow today.” By default CAKE uses a 3 tin classification mode called 'diffserv3'.
Also run “tc -d qdisc ; tc -s qdisc” on the router's command line to check whether the expected shapers (ingress/egress) were instantiated, “not heavily error checked” for these two fields is emphatic for “not at all” and the placement under “Dangerous Configuration” quite fitting. E.g.
The key message of this note is that the right setup script for you will depend on your connection, your router and your Background: I play CS GO on a very competitive level and the only purpose of the router/internet is to get this game to its maximum advantage. We'll come back to the 'ingress' option a little later. The maximum observed combined download+upload speed was ~110 Mbit/s.) The “ingress” keyword instructs cake to basically try to keep the incoming packet rate ⇐ the configured shaper rate. Bufferbloat is most evident when the link is heavily loaded.
An important exception to the above rules is when the bandwidth limit is set by the If you do not agree leave the website.Except where otherwise noted, content on this wiki is licensed under the following license: docs:guide-user:network:traffic-shaping:sqm-details Now generate some traffic through the router (and the SQM instance).
To use them,
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