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Raspberry Pi 4B Wi-Fi通信速度測定
7
Last updated at Posted at 2019-12-01
【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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