Hi, I decided to start my adventure with mt76. I bought the cheapest router I could find: Xiaomi Mi Router 4C and installed OpenWrt 21.02-rc3 on it. OpenWrt 21.02-rc3 contains mt76 from May: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=43e4ba586336383b34698a00d4588a17b853922f It *does not* include some later changes from June: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=20f66649dda3094320e515006cd5ddc9c096ac30 (or the very latest changes). My problem is unstable WiFi (as vague as this description is). I often experience stalls (I can't even see beacons) and sometimes some slow downs. I started using this device about 6 hours ago and experienced 3 or 4 traffic stops with no beacons. WiFi can work flawlessly for an hour, e.g. this iperf2 session: [ 3] 0.0-3339.0 sec 25.3 GBytes 65.1 Mbits/sec And another time it can suddently stop: [ 3] 54.0-55.0 sec 5.38 MBytes 45.1 Mbits/sec [ 3] 55.0-56.0 sec 5.88 MBytes 49.3 Mbits/sec [ 3] 56.0-57.0 sec 8.12 MBytes 68.2 Mbits/sec [ 3] 57.0-58.0 sec 5.12 MBytes 43.0 Mbits/sec [ 3] 58.0-59.0 sec 6.88 MBytes 57.7 Mbits/sec [ 3] 59.0-60.0 sec 7.88 MBytes 66.1 Mbits/sec [ 3] 60.0-61.0 sec 7.88 MBytes 66.1 Mbits/sec [ 3] 61.0-62.0 sec 5.04 MBytes 42.3 Mbits/sec [ 3] 62.0-63.0 sec 318 KBytes 2.61 Mbits/sec [ 3] 63.0-64.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 64.0-65.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 65.0-66.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 66.0-67.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 67.0-68.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 68.0-69.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 69.0-70.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 70.0-71.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 71.0-72.0 sec 0.00 Bytes 0.00 bits/sec (I didn't move my AP, didn't move my STA, didn't get new STAs). After stall as above I can't even reconnect. Most attempts fail as I can't even see a single beacon. Sometimes I catch a single beacon and even manage to connect but not even ping can reach my AP. Sometimes traffic just stops for a few seconds: [ 3] 1120.0-1121.0 sec 2.88 MBytes 24.1 Mbits/sec [ 3] 1121.0-1122.0 sec 3.62 MBytes 30.4 Mbits/sec [ 3] 1122.0-1123.0 sec 1.20 MBytes 10.1 Mbits/sec [ 3] 1123.0-1124.0 sec 2.00 MBytes 16.8 Mbits/sec [ 3] 1124.0-1125.0 sec 3.12 MBytes 26.2 Mbits/sec [ 3] 1125.0-1126.0 sec 5.12 MBytes 43.0 Mbits/sec [ 3] 1126.0-1127.0 sec 4.38 MBytes 36.7 Mbits/sec [ 3] 1127.0-1128.0 sec 5.25 MBytes 44.0 Mbits/sec [ 3] 1128.0-1129.0 sec 3.49 MBytes 29.2 Mbits/sec [ 3] 1129.0-1130.0 sec 509 KBytes 4.17 Mbits/sec [ 3] 1130.0-1131.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1131.0-1132.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1132.0-1133.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1133.0-1134.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1134.0-1135.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1135.0-1136.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1136.0-1137.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1137.0-1138.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1138.0-1139.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1139.0-1140.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1140.0-1141.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1141.0-1142.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1142.0-1143.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1143.0-1144.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 1144.0-1145.0 sec 128 KBytes 1.05 Mbits/sec [ 3] 1145.0-1146.0 sec 3.62 MBytes 30.4 Mbits/sec [ 3] 1146.0-1147.0 sec 4.38 MBytes 36.7 Mbits/sec [ 3] 1147.0-1148.0 sec 3.88 MBytes 32.5 Mbits/sec [ 3] 1148.0-1149.0 sec 4.50 MBytes 37.7 Mbits/sec [ 3] 1149.0-1150.0 sec 3.75 MBytes 31.5 Mbits/sec Or slows down: [ 3] 1316.0-1317.0 sec 3.88 MBytes 32.5 Mbits/sec [ 3] 1317.0-1318.0 sec 3.00 MBytes 25.2 Mbits/sec [ 3] 1318.0-1319.0 sec 4.75 MBytes 39.8 Mbits/sec [ 3] 1319.0-1320.0 sec 3.00 MBytes 25.2 Mbits/sec [ 3] 1320.0-1321.0 sec 3.88 MBytes 32.5 Mbits/sec [ 3] 1321.0-1322.0 sec 2.95 MBytes 24.7 Mbits/sec [ 3] 1322.0-1323.0 sec 1018 KBytes 8.34 Mbits/sec [ 3] 1323.0-1324.0 sec 954 KBytes 7.82 Mbits/sec [ 3] 1324.0-1325.0 sec 827 KBytes 6.78 Mbits/sec [ 3] 1325.0-1326.0 sec 891 KBytes 7.30 Mbits/sec [ 3] 1326.0-1327.0 sec 827 KBytes 6.78 Mbits/sec [ 3] 1327.0-1328.0 sec 764 KBytes 6.26 Mbits/sec [ 3] 1328.0-1329.0 sec 1.50 MBytes 12.6 Mbits/sec [ 3] 1329.0-1330.0 sec 1.23 MBytes 10.4 Mbits/sec [ 3] 1330.0-1331.0 sec 1.18 MBytes 9.93 Mbits/sec [ 3] 1331.0-1332.0 sec 3.00 MBytes 25.2 Mbits/sec [ 3] 1332.0-1333.0 sec 2.25 MBytes 18.9 Mbits/sec [ 3] 1333.0-1334.0 sec 1.34 MBytes 11.2 Mbits/sec [ 3] 1334.0-1335.0 sec 1.24 MBytes 10.4 Mbits/sec [ 3] 1335.0-1336.0 sec 1.24 MBytes 10.4 Mbits/sec [ 3] 1336.0-1337.0 sec 1.75 MBytes 14.7 Mbits/sec [ 3] 1337.0-1338.0 sec 5.25 MBytes 44.0 Mbits/sec [ 3] 1338.0-1339.0 sec 4.38 MBytes 36.7 Mbits/sec [ 3] 1339.0-1340.0 sec 3.75 MBytes 31.5 Mbits/sec [ 3] 1340.0-1341.0 sec 3.88 MBytes 32.5 Mbits/sec Whenever any issue occurs I don't see anything in my dmesg. Every time it happens it affects all of my 3 STAs (notebook + 2 smartphones). Waiting for few minutes brings things back to normal. I don't need any hostapd restart / device reboot. Stability problem was reported for this router multiple times by different users. Reports go back to the October 2020 when OpenWrt received that router support. https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/42 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/46 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/48 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/52 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/65 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/97 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/112 https://forum.openwrt.org/t/openwrt-for-xiaomi-mi-router-4c/72175/113 Is there anything I can do to help debugging / fixing this?
