here is my example of sqm qos running on luci openwrt (router is wrt32x)

i set different limits on specific interfaces, i determine the optimum speed that my local wireless clients can transmit without bloat (lower ping time)

wlan1 is wireless N 2.4g, wlan0 is wireless ac 5g.

i set to these 2 interface, about 28mbit/s to download (which is upload for wireless client)

and i set to the WAN 48mbit/s upload (my fibre’s upload limit is 50mbit/s)

all these settings can improve the connection quality for the wireless clients, especially when they play mobile games (bufferbloat)

you can also set shaping limit for wireguard / openvpn interface, if you want to limit bandwidth usage.

of course the shaping you wish for, the bigger cpu processing power and ram required

I think your quad core routers and gl-mv routers should be able to handle some work reasonably

the disadvantage, is if you are looking to limit bandwidth to specific IP address, this will not work

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