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Raspberry Pi 4B Wi-Fi通信速度測定

【序文】

Pi4B を入手したので Wi-Fi通信速度を測定してみた。
Pi3B+ と Wi-Fiチップは同じらしいので、測定するまでもないかと思いきや……。

【環境】

前回 Wi-Fi通信速度測定 と同じ。

【測定】

Pi4B の測定結果は以下。

pi@raspberrypi4:~ $ iperf3 -c 192.168.11.101
Connecting to host 192.168.11.101, port 5201
[  5] local 192.168.11.113 port 33332 connected to 192.168.11.101 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  8.13 MBytes  68.2 Mbits/sec    0    256 KBytes
[  5]   1.00-2.00   sec  7.77 MBytes  65.2 Mbits/sec    0    269 KBytes
[  5]   2.00-3.00   sec  7.95 MBytes  66.7 Mbits/sec    0    354 KBytes
[  5]   3.00-4.00   sec  8.02 MBytes  67.2 Mbits/sec    0    354 KBytes
[  5]   4.00-5.00   sec  4.78 MBytes  40.1 Mbits/sec    0    389 KBytes
[  5]   5.00-6.00   sec  7.39 MBytes  62.0 Mbits/sec    0    414 KBytes
[  5]   6.00-7.00   sec  8.45 MBytes  70.9 Mbits/sec    0    438 KBytes
[  5]   7.00-8.00   sec  7.95 MBytes  66.7 Mbits/sec    0    438 KBytes
[  5]   8.00-9.00   sec  8.45 MBytes  70.9 Mbits/sec    0    438 KBytes
[  5]   9.00-10.00  sec  7.95 MBytes  66.7 Mbits/sec    0    438 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  76.9 MBytes  64.5 Mbits/sec    0             sender
[  5]   0.00-10.00  sec  75.9 MBytes  63.7 Mbits/sec                  receiver

iperf Done.

速度は 64.5 Mbits/sec で目を疑う。

【実行結果まとめ】

Pi3B+、PiZero WH も測定。結果は以下。

Pi 使用周波数帯域 Mbits/sec
Pi4B 5GHz 64.5
Pi3B+ 5GHz 90.6
PiZero WH 2.4GHz 28.6

【所感】

Pi4B+ の数字があまりにも悪いので何回か測定したけど、40~80台とかなりばらつきがあり、安定性も欠ける感じ。
何でこんなにパフォーマンスが悪いの?

ついでに iwconfig wlan0 でリンクスピードも確認。(Link Quality項目)

  • Pi3B+
pi@raspberrypi3-2:~ $ iwconfig wlan0
wlan0     IEEE 802.11  ESSID:"********-A-6***"
          Mode:Managed  Frequency:5.2 GHz  Access Point: 18:C2:BF:67:63:84
          Bit Rate=135 Mb/s   Tx-Power=31 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=46/70  Signal level=-64 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
  • Pi4B
pi@raspberrypi4:~ $ iwconfig wlan0
wlan0     IEEE 802.11  ESSID:"********-A-6***"
          Mode:Managed  Frequency:5.2 GHz  Access Point: 18:C2:BF:67:63:84
          Bit Rate=135 Mb/s   Tx-Power=31 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=38/70  Signal level=-72 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:148  Invalid misc:0   Missed beacon:0

う~ん、やはり Pi4B の方が遅いし。

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