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searchwing-pi-datarate [2021/11/17 22:35] wf68spef |
searchwing-pi-datarate [2021/11/18 15:08] (current) wf68spef [pi4 config] |
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| * Fritzbox 7520 | * Fritzbox 7520 | ||
| * CM4 5Ghz Wifi | * CM4 5Ghz Wifi | ||
| - | * Laptop T14 via Ethernet | + | * Laptop T14 via Gigabit EthernetÌý |
| + | Ìý | ||
| + | Ìý | ||
| + | Ìý | ||
| + | ==== pi4 theoretical speed ====Ìý | ||
| + | Ìý | ||
| + | from https://forums.raspberrypi.com/viewtopic.php?t=291824&start=25#p1768600Ìý | ||
| + | Ìý | ||
| + | //Fri Nov 27, 2020 2:03 pmÌý | ||
| + | The WiFi chip is connected via a 4-bit SDIO link that typically runs at 41.7MHz giving an upper **limit on throughput of ~160Mbs**. In practise you won't get close to that because it is a simplex link (only one direction at a time) and there is overhead in each of the protocol and transport layers. Given that, 112Mbps sounds pretty good. Even though the throughput hasn't increased, being able to properly use the wide channels means that the channel (which is a shared medium) is occupied for a shorter time, leaving more time for other devices.Ìý | ||
| + | Ìý | ||
| + | // | ||
| ==== pi4 config ==== | ==== pi4 config ==== | ||
| Line 545: | Line 556: | ||
| channel 64 (5320 MHz), width: 80 MHz, center1: 5290 MHz | channel 64 (5320 MHz), width: 80 MHz, center1: 5290 MHz | ||
| txpower 31.00 dBm | txpower 31.00 dBm | ||
| + | |||
| + | pi@testi:~ $ iwconfig wlan0 | ||
| + | wlan0 IEEE 802.11 ESSID:"XXXXXXXXXXXX" | ||
| + | Mode:Managed Frequency:5.32 GHz Access Point: 3C:A6:2F:CB:E0:7E | ||
| + | Bit Rate=433.3 Mb/s Tx-Power=31 dBm | ||
| + | Retry short limit:7 RTS thr:off Fragment thr:off | ||
| + | Power Management:on | ||
| + | Link Quality=70/70 Signal level=-29 dBm | ||
| + | Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 | ||
| + | Tx excessive retries:1 Invalid misc:0 Missed beacon:0 | ||
| + | |||
| </code> | </code> | ||