I recently upgraded from 18.06 to 19.07 and noticed a significant performance degradation of luci-app-sqm.
In 18.06 i almost always got an 'A' bufferbloat rating @ http://www.dslreports.com/speedtest.
Now I get between 'C' and 'F'.
The issue seems to exist in both rc1 and rc2.
I have followed the guide https://openwrt.org/docs/guide-user/network/traffic-shaping/sqm, and tried fiddling with the settings, but nothing improves the performance noticeably.
I've monitored the Luci GUI Realtime Graph. It stops updating during a speedtest, and the peak value increases from ~2 to ~3.
When run 'top -n 1' via ssh, 'sirq' increases from always < 20 % to > 90 % and top also stop printing each second.
Is anyone else experiencing this issue?
Is the RT-N56U hardware getting too old for SQM / should I get a new router?
Any response is appreciated.