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Large Oscillations in Speed down to 0 bit/s on 5ghz WiFi #181

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@Mushoz

Description

@Mushoz

I am using a Dir-860l, with an Android phone (OnePlus 5 running LineageOS 15.1) as client device to test. The iperf3 server is connected via a cable. I am running into the same issue with the latest master branch and the 18.06 branch. I did not have this issue on 17.01.4.

-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.1.158, port 47216
[  5] local 192.168.1.155 port 5201 connected to 192.168.1.158 port 47218
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  17.8 MBytes   150 Mbits/sec                  
[  5]   1.00-2.00   sec  25.3 MBytes   212 Mbits/sec                  
[  5]   2.00-3.00   sec  24.4 MBytes   205 Mbits/sec                  
[  5]   3.00-4.00   sec  22.2 MBytes   186 Mbits/sec                  
[  5]   4.00-5.00   sec  29.5 MBytes   248 Mbits/sec                  
[  5]   5.00-6.00   sec  19.3 MBytes   162 Mbits/sec                  
[  5]   6.00-7.00   sec  15.5 MBytes   130 Mbits/sec                  
[  5]   7.00-8.00   sec  14.5 MBytes   122 Mbits/sec                  
[  5]   8.00-9.00   sec  19.8 MBytes   166 Mbits/sec                  
[  5]   9.00-10.00  sec  26.7 MBytes   224 Mbits/sec                  
[  5]  10.00-11.00  sec  20.2 MBytes   170 Mbits/sec                  
[  5]  11.00-12.00  sec  26.4 MBytes   222 Mbits/sec                  
[  5]  12.00-13.00  sec  30.5 MBytes   256 Mbits/sec                  
[  5]  13.00-14.00  sec  30.0 MBytes   252 Mbits/sec                  
[  5]  14.00-15.00  sec  27.1 MBytes   227 Mbits/sec                  
[  5]  15.00-16.00  sec  12.8 MBytes   107 Mbits/sec                  
[  5]  16.00-17.00  sec  18.7 MBytes   157 Mbits/sec                  
[  5]  17.00-18.00  sec  17.3 MBytes   146 Mbits/sec                  
[  5]  18.00-19.00  sec  10.3 MBytes  86.6 Mbits/sec                  
[  5]  19.00-20.00  sec  25.8 MBytes   216 Mbits/sec                  
[  5]  20.00-21.00  sec  27.9 MBytes   234 Mbits/sec                  
[  5]  21.00-22.00  sec  23.5 MBytes   197 Mbits/sec                  
[  5]  22.00-23.00  sec  4.87 MBytes  40.8 Mbits/sec                  
[  5]  23.00-24.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  24.00-25.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  25.00-26.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  26.00-27.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  27.00-28.00  sec  1.25 MBytes  10.5 Mbits/sec                  
[  5]  28.00-29.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  29.00-30.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  30.00-31.00  sec  1.25 MBytes  10.5 Mbits/sec                  
[  5]  31.00-32.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  32.00-33.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  33.00-34.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  34.00-35.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  35.00-36.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  36.00-37.00  sec  16.4 MBytes   137 Mbits/sec                  
[  5]  37.00-38.00  sec  23.2 MBytes   195 Mbits/sec                  
[  5]  38.00-39.00  sec  23.0 MBytes   193 Mbits/sec                  
[  5]  39.00-40.00  sec  26.7 MBytes   224 Mbits/sec                  
[  5]  40.00-41.00  sec  27.7 MBytes   232 Mbits/sec                  
[  5]  41.00-42.00  sec  21.4 MBytes   179 Mbits/sec                  
[  5]  42.00-43.00  sec  15.6 MBytes   131 Mbits/sec                  
[  5]  43.00-44.00  sec  15.5 MBytes   130 Mbits/sec                  
[  5]  44.00-45.00  sec  18.0 MBytes   151 Mbits/sec                  
[  5]  45.00-46.00  sec  16.6 MBytes   139 Mbits/sec                  
[  5]  46.00-47.00  sec  19.6 MBytes   164 Mbits/sec                  
[  5]  47.00-48.00  sec  17.8 MBytes   149 Mbits/sec                  
[  5]  48.00-49.00  sec  19.5 MBytes   163 Mbits/sec                  
[  5]  49.00-50.00  sec  6.40 MBytes  53.7 Mbits/sec                  
[  5]  50.00-51.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  51.00-52.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  52.00-53.00  sec  1.28 MBytes  10.8 Mbits/sec                  
[  5]  53.00-54.00  sec   580 KBytes  4.75 Mbits/sec                  
[  5]  54.00-55.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  55.00-56.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  56.00-57.00  sec  1.10 MBytes  9.25 Mbits/sec                  
[  5]  57.00-58.00  sec  1.06 KBytes  8.67 Kbits/sec                  
[  5]  58.00-59.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  59.00-60.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  60.00-61.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  61.00-62.00  sec  1.16 MBytes  9.77 Mbits/sec                  
[  5]  62.00-63.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  63.00-64.00  sec  1.24 KBytes  10.1 Kbits/sec                  
[  5]  64.00-65.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  65.00-66.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  66.00-67.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  67.00-68.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  68.00-69.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  69.00-70.00  sec  2.92 MBytes  24.5 Mbits/sec                  
[  5]  70.00-71.00  sec  17.0 MBytes   143 Mbits/sec                  
[  5]  71.00-72.00  sec  17.0 MBytes   142 Mbits/sec                  
[  5]  72.00-73.00  sec  14.6 MBytes   122 Mbits/sec                  
[  5]  73.00-74.00  sec  12.4 MBytes   104 Mbits/sec                  
[  5]  74.00-75.00  sec  18.1 MBytes   151 Mbits/sec                  
[  5]  75.00-76.00  sec  20.0 MBytes   168 Mbits/sec                  
[  5]  76.00-77.00  sec  22.9 MBytes   192 Mbits/sec                  
[  5]  77.00-78.00  sec  21.2 MBytes   178 Mbits/sec                  
[  5]  78.00-79.00  sec  25.8 MBytes   217 Mbits/sec                  
[  5]  79.00-80.00  sec  23.5 MBytes   197 Mbits/sec                  
[  5]  80.00-81.00  sec  23.4 MBytes   196 Mbits/sec                  
[  5]  81.00-82.00  sec  24.1 MBytes   202 Mbits/sec                  
[  5]  82.00-83.00  sec  22.6 MBytes   190 Mbits/sec                  
[  5]  83.00-84.00  sec  26.6 MBytes   223 Mbits/sec                  
[  5]  84.00-85.00  sec  22.2 MBytes   186 Mbits/sec                  
[  5]  85.00-86.00  sec  24.0 MBytes   201 Mbits/sec                  
[  5]  86.00-87.00  sec  27.0 MBytes   227 Mbits/sec                  
[  5]  87.00-88.00  sec  26.3 MBytes   220 Mbits/sec                  
[  5]  88.00-89.00  sec  25.0 MBytes   210 Mbits/sec                  
[  5]  89.00-90.00  sec   180 KBytes  1.48 Mbits/sec                  
[  5]  90.00-91.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  91.00-92.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  92.00-93.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  93.00-94.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  94.00-95.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  95.00-96.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  96.00-97.00  sec  1.27 MBytes  10.7 Mbits/sec                  
[  5]  97.00-98.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  98.00-99.00  sec  0.00 Bytes  0.00 bits/sec                  
[  5]  99.00-100.00 sec  0.00 Bytes  0.00 bits/sec                  
[  5] 100.00-101.00 sec  0.00 Bytes  0.00 bits/sec                  
[  5] 101.00-102.00 sec  0.00 Bytes  0.00 bits/sec                  
[  5] 102.00-103.00 sec  0.00 Bytes  0.00 bits/sec                  
[  5] 103.00-104.00 sec  11.8 MBytes  99.5 Mbits/sec                  
[  5] 104.00-105.00 sec  22.3 MBytes   187 Mbits/sec                  
[  5] 105.00-106.00 sec  17.2 MBytes   144 Mbits/sec                  
[  5] 106.00-107.00 sec  21.2 MBytes   178 Mbits/sec                  
[  5] 107.00-108.00 sec  6.29 MBytes  52.8 Mbits/sec                  
[  5] 108.00-109.00 sec  14.4 MBytes   121 Mbits/sec                  
[  5] 109.00-110.00 sec  12.4 MBytes   104 Mbits/sec                  
[  5] 110.00-111.00 sec  21.9 MBytes   183 Mbits/sec                  
[  5] 111.00-112.00 sec  12.5 MBytes   105 Mbits/sec

As a side-note, I am not sure whether this can also be of influence, but I am running wpad instead of wpad-mini. I am also using 802.11r, which I was not using on 17.01.4. I can retest without those options if those might be of influence.

Edit: Still happens with 802.11r disabled.

Edit 2: This only happens with uploads to the router. Luci overview shows this during the bug as the RX rate: 6.0 Mbit/s, 20MHz

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