You are downloading a large file on your computer, and it's putting so much stress on the bandwidth that you can't even open a webpage on any other device on that network. It's called Bufferbloat. Bufferboat has long been one of the most common problems of any shared network.
There have been numerous attempts at mitigating Bufferbloat, but most of these are for corporate-grade networks and are proprietary. Consumer-grade and SOHO routers have historically been notorious for their bad bandwidth management, and most SOHO routers don't come with a Bufferbloat solution set-up.
Those that come with one have interfaces that will put 90's systems to shame. If you are someone like me who likes to set up his router once and then keeps running 24x7x without any interaction, then it might be the savior for you. I have been using this for the last several months without a single reboot of my router, and to my surprise, my SOHO router still runs like a champ.
SQM QoS is a very lightweight package. I will also install any dependency it might have. First, we will need to login to our router's SSH Dropbear interface. I assume you already know this step. If you don't want luci interface, run this instead : opkg update; opkg install sqm-scripts. Now in that Download and install package field, type luci-app-sqm and click OK.
It should show a confirmation message. Please click here if you are not redirected within a few seconds. Little background You are downloading a large file on your computer, and it's putting so much stress on the bandwidth that you can't even open a webpage on any other device on that network. Please don't select your LAN network. Download Speed: Go to Speedtest. Note down the Upload Speed and Download Speed. Now go to the Queue Discipline tab. Via SSH Run the following lines.
Make sure to configure the commented lines. You are now all set to enjoy a Bufferbloat-free internet experience.Configuring iptables-mod-conntrack-extra. Thanks for all the hard work. Con quel CAKE v includes tc filter classification making ingress prioritisation easier. If you're router has two cores Cake is optimal. Might need a recent or custom build of LEDE. As of right now is there no way for us to do an "Offline" install of ST's?
It would be great if it was possible for you to give us the "Game Library update" that brought us 2x ST as an offline file that we could then force install. Could you please help me? Thank you. They work by restricting the bandwidth that flows through an interface ingress, egress, or bothand then carefully managing the queue so that it doesn't add any or much latency.
The only time I see major improvement is when I limit myself to 10 down. Using cake as the discipline and layer of cake as the setup script. By reducing the features it runs, it is easier to run and set up. LEDE has already integrated cake support into the main source repo, ever since I wrote the patches in June to get it in. Package: aria2 Version: 1. Here are a few links for cake. Check the Enable box. If running SQM Cake already on your router, no need for the config listed in the article.
Why is that? Is the performance that huge between those two? I tried to test this but I didn't see any real difference. These algorithms were developed as part of the CeroWrt project. I am running "stock" OpenWrt Click Remove if either of these scripts is installed.
I'm only familiar with the GUI luci-app-sqm on openWrt and don't know how to use tc to do this on Padavan. Tried it on wndr, wrtacsv2 and tp link c7 v5 shows cake winning over sqm-scripts. If you get a poor bufferbloat score, openwrt can help. Despite small teams and budgets, they power so many routers and are also good at research and new features. GitHub Gist: instantly share code, notes, and snippets. Its a neat device though running OpenWRT, you have full "cake" SQM which is a marvel of technology in my opinion, it's wifi is good and it uses like 5W.
Openwrt is so nice. If you do not want to use luci, remove luci-app-sqm from the command above. I'm using "Linux OpenWrt 4.Updated - April 16, by Arnab Satapathi.
Fair bandwidth sharing among different devices may be an issue on a local network, say torrent client on the PC sucking all upload bandwidth. If the router is running openwrt, such situation could be avoided by setting up openwrt qos.
What is QoS? It stands for Quality of Servicesimply how efficiently the bandwidth could be used to improve network quality and minimize network latency. It also ensures a fair portion of bandwidth is always available for critical applications. Internet quality degradation on a fast network is mainly due to bufferbloatexcessive data buffering on the router causes this problem. In this tutorial we're going to use the luci-app-sqm program to configure openwrt qos. Though both of them uses the tc command, part of traffic control application as QoS configuration back end.
Uninstall other previously installed if any OpenWrt QoS related packages like luci-app-qos or qos-scriptsthey will interfere with sqm-scripts. Installation process may require KB or more storage space, so if your router has limited flash space, openwrt extroot setup may be necessary. The official OpenWrt guide recommends to use www. Though network latency measurement is not necessary, you could do it with ping command.
Note the time required to ping different domains and take the average time. Example bellow. From those tests I got about 2. You may want to use google's data transfer rate converter to convert different formats.
QoS capability could be tested many way, I'm giving an example bellow to simulate such situation. Surely the above setup will impose a heavy stress on the network, now you from the last PC you could do some ping to remote servers like google, browse few webpages etc. Now everything should be somewhat smoother than previous, i.
OpenWrt is bloating day by day, the luci is even more bloated, seriously a bad news for routers with limited flash.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
Already on GitHub? Sign in to your account. I'd like to move some of my company's pfsense boxes over to a distro that uses something like this. This seems seriously non-trivial to do in FreeBSD given the chatter in the pfsense community about this. We're using a different system for traffic shaping and QoS ipfw dummynetwhich doesn't contain the codel algorithm. I've read the page you provided and a bit more on the topic thanks btw.
There seems to be dual-licensed code that could make its way into FreeBSD in another way. The work looks very promising.
Reduce internet lag on OpenWRT
I also like the zero-config approach, although in theory this shouldn't be a subsystem, it should be a holistic switch that covers all traffic flowing through the box or an interface.
As such it may have side effects with an enabled traffic shaper, but it's better than having to deal with "either this or that, not both" scenarios. Or at least that's how the GUI should handle it, right? Honestly, I'm not sure - it's dual licensed but from what I've read I'm no expert on kernels or low-level nets code the port to FreeBSD is not easy.
Great news indeed, this probably won't make it into FreeBSD The OPNsense traffic shaper code is basically ready for this as is now. Very cool. Great job! Benchmarks wanted.
Test 1: ipfw enabled, but not passed through dummynet. Test 3: CoDel enabled, using defaults. Test 4: FQ-CoDel enabled, using defaults. The work will continue on our end, e. AQM v0.Sample. Bufferbloat test using sqm qos with cake and piece of cake algorithms
You should have seen ms latency on this test with pure codel. Also, you can turn off log scales when generating test results in flent PS: If you could stick up your flent. While testing, I had 2 different pipes 1 up, 1 down limited to the max line speed 1Gbpsso shaping could certainly have impacted my performance a bit. I can rerun the tests later under approx the same circumstances and send them to you then.The remainder of this page gives some of the theory behind SQM, should you be curious about it.
You should also check the Bufferbloat site for considerably more detail. Smart Queue Management SQM is our name for an intelligent combination of better packet scheduling flow queueing techniques along with with active queue length management AQM. These algorithms were developed as part of the CeroWrt project. They have been tested and refined over the last four years, and have been accepted back into OpenWrt, the Linux Kernel, and in dozens of commercial offerings.
To do this. For example, if you have measured 6. SQM is designed to manage the queues of packets waiting to be sent across the slowest bottleneck link, which is usually your connection to the Internet. Since the majority of ISP provided configurations for buffering are broken today, you need take control of the bottleneck link away from the ISP and move it into the router so it can be fixed.
You do this by entering link speeds that are a few percent below the actual speeds. Use a speed test program or web site like the DSL Reports Speed Test to get an estimate of the actual download and upload values. After setting the initial Download and Upload entries, you should feel free to try the suggestions at A little about tuning SQM above to see if you can further increase the speeds. So how to estimate what speedtest result is a good match for a given shaper bandwidth? Just use the following formula and plug in the correct values:.
The Queue Discipline tab controls how packets are prioritized for sending and receipt. The default settings shown here work very well for nearly all circumstances.
Those defaults are:. The default cake queueing discipline works well in virtually all situations. Feel free to try out other algorithms to see if they work better in your environment. This provides good defaults. 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. That receiver sends the congestion notification back to the sender, which can adjust its rate.
This provides faster feedback than having the router drop the received packet. They are not heavily error checked, so be careful that they are exactly as shown when you enter them. As with other options in this tab, it is safe to leave them at their default. They include:. The purpose of Link Layer Adaptation is to give the shaper more knowledge about the actual size of the packets so it can calculate how long packets will take to send.
When the upstream ISP technology adds overhead to the packet, we should try to account for it. This primarily makes a big difference for traffic using small packets, like VOIP or gaming traffic.
Getting this value exactly right is less important than getting it close, and over-estimating by a few bytes is generally better at keeping bufferbloat down than underestimating. With this in mind, to get started, set the Link Layer Adaptation options based on your connection to the Internet.
The general rule for selecting the Link Layer Adaption is:. If you are not sure what kind of link you have, first try using Ethernet with Overhead and set 44 bytes. Then run the Quick Test for Bufferbloat. If you get your internet through an old-style copper wired phone line and your speeds are less than a couple of megabits, you have ATM so see above for the ATM entry.
An important exception to the above rules is when the bandwidth limit is set by the ISP 's traffic shaper, not by the equipment that talks to the physical line. Let's consider an example. In fact, it is more likely to work at the IP level, which means that none is the appropriate setting.There are three sub-tabs in the SQM tab that you may configure:.
Cake - Common Applications Kept Enhanced
Smart Queue Management SQM is our name for an intelligent combination of better packet scheduling flow queueing techniques along with with active queue length management AQM. You may have to log out and in to see the new menu.
Set the Download and Upload speeds to be somewhat below the speed of your Internet connection. There are two choices:. Please note these are arbitrary values chosen to give you a good result on the first try. You can increase them later. An example of a tuning session for a common cable modem configuration is here using the RRUL test.
If you get 6. Use a longer test than that for cable. For example, you can expect a cable modem showing 30Mbit down for a speedtest to actually only do 22Mbit over longer periods. Since the majority of ISP provided configurations for buffering are broken today, you need take control of the bottleneck link away from the ISP and move it into CeroWrt so it can be fixed.
You do this by entering link speeds that are a few percent below the actual speeds. Note: it can be difficult to get an accurate measurement of the link speeds. See Example 1 above. Even better tools are netalyzr and rrulwhich run for long enough to get more accurate measurements.
See Example 2 above. Just use the default settings shown here - they work very well for nearly all circumstances. Those defaults are:. If you feel like experimenting, change these settings and let us know the results on the CeroWrt-Devel mailing list. CeroWrt has been primarily a tool for research into better packet scheduling and AQM technologies. If you want to get a feel for how cable modems will work in the future, try pie.The content of this topic has been archived between 28 Apr and 30 Apr There are no obvious gaps in this topic, but there may still be some posts missing at the end.
I am trying to setup sqm-scripts in my home network. I am using a custom compiled version of Barrier Breaker to save space I can post my. However, my Download speed slowed to a crawl: something like kbps in SpeedTest my normal speed is something like kbps. What I find curious is if I set my Upload speed to 0 in sqm-scripts it seems to works.
So I want to know if setting Upload to 0 is ok and maybe Download too or is there something wrong that I missed in my setup. I can provide additional information if it helps. Well, just something I forget: I tried to set my interface to eth0 and wan. It is not really clear to me what is the correct interface to set sqm-scripts I think it is eth0, however I am not sure.
I would be amazed though if your router would not be able to shape traffic at the combined 6 Mbps your link seems to require.
Setting the bandwidth for one direction to zero effectively disables sqm in that direction, so this points at the uplink direction being the culprit, setting both to zero should be exactly equal to sqm being disabled completely Well setting both to 0 is just an opaque way of disabling sqm completely So given that downstream shaping seems to work okay we should concentrate on the upstream which in theory should be easier.
Could you please post the information I asked for above? Hopefully we can fix this issue for you Interesting, on CC and trunk I would have assumed the correct interface to be pppoe-wan, maybe after updating sqm-scripts from github pppoe-wan appears in the interface selection list? I will try to backport just this package to BB.
I tried to compile DD however even disabling IPv6 was not enough to fit everything I needed in my image that is basically luci, luci-app-sqm and luci-app-upnpsince my router has only 4MB of Flash. I will try to measure the actual overhead, however even disabling this option resulted in the same problem.
I still had the same issue of having a absurdly low download speed after sqm was on. I will do it when I have some spare time. I need to have everyone in the house sleeping or something or I will have angry users saying that the "internet is not working" for them. For now I got back to Gargoyle since it seems to be working fine. From what I understand from documentation, yes. However, even putting 0 in both Download and Upload I still had some effect in bufferbloat and total bandwidth.
I remember I tried this one too when I was testing another time, and still had the same issue. Anyway, maybe it would be better to improve the documentation in the Wiki if pppoe-wan is the correct interface? The documentation is confusing in this part. Thanks for the help. Well, the correct interface really depends on what a user wants to do, so there is no "a priori" right or wrong it really depends on what one wants to do.