About SQM | WR940N v4

hi, recently i tri lede 17.01
about sqm
what interface on sqm setup should i use?
eth0(wan/internet)
br-lan
or wlan0?
thanks, sorry for bad englando
currently i use eth0

anyone?
help

You set it up on your wan interface, which is eth0 in your case. You can read more on the subject here:
https://lede-project.org/docs/howto/sqm

thanks,
i set up on wan