Raspberry Pi 3 acting as a WiFi AP hosting 2.4Ghz and 5Ghz Wifi AP's. The AP of concern is the 2.4Ghz network. The NIC is a TP-Link WN722N adapter using driver
A speedtest done from the Raspberry Pi 3 results in:
- Download: 21.69 Mbit/s
- Upload: 18.32 Mbit/s
which is expected and correct.
Clients connecting to the 2.4Ghz hosted network doing a speedtest results in:
- Download: 1-11 Mbit/s (AVG: 2.5 Mbit/s)
- Upload: 14-18 Mbit/s
note: Changing router channels does not have any effect on the download speed of hosted wifi network.
A shared ethernet connection, hosted by the Raspberry Pi, to which clients connect do not experience this issue. These achieve expected download speeds.
Since all NIC's report correct download and upload speed except the hosted wifi network (2.4Ghz adapter) using the
ath9k_htc driver has slow download speed, is this an issue with the ath9k_htc driver?
Some HW Info:
note: The hosted 5Ghz network does not have this download issue, speeds are correct and as expected
sudo lshw -C net *-usb:1 description: Wireless interface product: USB2.0 WLAN vendor: ATHEROS physical id: 3 bus info: usb@1:1.3 logical name: wlan2 version: 1.08 serial: 12345 capabilities: usb-2.00 ethernet physical wireless configuration: broadcast=yes driver=ath9k_htc driverversion=4.9.35-v7+ firmware=1.3 ip=192.168.2.254 link=yes maxpower=500mA multicast=yes speed=480Mbit/s wireless=IEEE 802.11
and hostapd config
cat /etc/hostapd/hostapd-2g.conf interface=wlan2 driver=nl80211 ssid=local-wifi hw_mode=g channel=11 ieee80211n=1 wmm_enabled=1 ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40] macaddr_acl=0 auth_algs=1 ignore_broadcast_ssid=0 wpa=2 wpa_key_mgmt=WPA-PSK wpa_passphrase=my_pass_here rsn_pairwise=CCMP logger_syslog=-1