I am a new user to LEDE, so be sure to ELI5. I have a TPLink Archer C5 v2 running the current factory install + SQM.
I installed it to help me manage the crappy bandwidth I have, which coincidentally is the best I can buy at my home. ( I can only get Century link... and the fastest they will sell me is DSL... 700kbps up/13mbps down ). Most of the time my issues can be described as textbook Buffer Bloat because I have 3 kids, and it seems like the internet is always slow.
SQM handles the issue beautifully, with the exception of 1 thing. I own a ring doorbell. When I have SQM disabled, the Ring doorbell always works... Notifications , video and audio. ( albeit Poor quality video and choppy audio though ).
When I enable SQM, I continue to get notifications from Ring, however the video is completely black. I have SQM configured as described on the setup pages, and have tried all of the different Queue disciplines.
Ring's support pages basically say that if this happens, there isnt enough bandwidth.
Is it really the case that this device uploads your video to the internet? Because there should be PLENTY of bandwidth to stream video via wifi between two devices on your LAN, and I assume the doorbell thingy is on the LAN as is the device you're receiving the video on. So it should only bottleneck if they first upload "to the cloud" and then your phone downloads from their server, which is about the stupidest thing I've heard all day and requires Ring to purchase bandwith proportional to their number of customers, and seems like a total waste of resources. EDIT: unless of course there's no receiver device on the LAN in which case you might want to proxy the video to a remote phone or whatever... but it seems like that shouldn't be the default.
Yeah, I added an edit it seems to me like the device should be able to find a receiver on the local LAN if it's there. If not, obviously you'd have to upload to the internet to get it to wherever the receiver is, but if doorbell and receiver are both on the same LAN and doorbell is sending to the internet and then receiver is downloading from the internet... wow, that's a lousy design.
It might also be intersting to use wireshark/tcpdump to create a packetcapture with someone ringing the ring bell and you trying to watch the video feed, I would especially look for the DSCP marking on the packets.
As a quick and dirty test you could:
Make sure the qdisc statistics counters are reset
/etc/init.d/sqm stop ; /etc/init.d/sqm start ; tc -s qdisc
Perform your Ring test (try to let the network be idle otherwise, does not need to be totally quiet, but it will be easier to compare the statistics outputs if the main traffic difference was driven by your test)
Get the statistics counters after the test
tc -s qdisc
and please post the output here (preferably as "preformatted text").
Assuming that you use cake this should show how many packets are dropped during the test.
Since most five year olds I know can neither read nor write, I am simply ignoring the ELI5 (and before @jwoods' expansion of the abbreviation I was completely ignorant of this, is thjs really a thing?).
Can my Ring device run only within my internal Wi-Fi LAN?
Ring products require internet connectivity to connect and send push notifications to your device. Connecting ensures that your Ring device can manage sessions and reach your smartphone or tablet whether you are at home or away.
Yeah, I agree about my crappy internet. I search for other options ( home LTE, or wireless broadband ) about once a month. It is just wierd that it works with my crappy internet with no SQM, but doesnt work when its enabled.
I know how to navigate a terminal and ssh... I just need to figure out how to ssh into the router as I havent set that up. Probably take a little time reading documentation.
In the meantime I grabbed some screenshots. I have a speedtest from dslreports with both SQM and without.
In that case you should be able to reach 800 Kbps for the uplink shaper and 18677.02 * 0.85 = 15875.467 for the downlink with hopefully still retaining an A or A+ bufferbloat rating.
One big difference between no SQM and SQM on your link is the considerable bandwidth sacrifice you give, which might bring Ring from marginally working to marginally not working, though I really have too little data for more than pure speculation on the real issue, but I believe it might be the time to try to optimize your overhead settings in sqm.
When I was tuning Fairpoint DSL on the EA8500 here, with the Fairpoint modem configured in (Bridged) mode - using (40) for the Per Packet Overhead gave the best results & allowed me to set the Egress *Upload speed higher.
Dunno if this applies to your config., just a thought.