If you are running iperf3 using laptop, try disable any firewall (including the one in your antivirus) on both server and client side.
Also, try run iperf3 using the "-w 433M" option for your Intel wireless supporting 433 Mbps Tx/Rx rate. You might also want to try "-R" to reverse the server and client sending.
QUOTE(wakhaiha @ Sep 16 2018, 10:31 PM)
I had turned off QoS, but it just the same. tried iperf, max can get ~230Mbps. also tried move router to other area (without wan access) for wifi testing purpose, to avoid interference. but the result just the same.
wireles log:
SSID: "xxxx@unifi"
RSSI: 0 dBm SNR: 0 dB noise: -92 dBm Channel: 4
BSSID: 4C:ED:FB:AA:3E:E0 Capability: ESS ShortSlot
Supported Rates: [ 1(b) 2(b) 5.5(b) 6 9 11(b) 12 18 24 36 48 54 ]
VHT Capable:
Chanspec: 2.4GHz channel 4 20MHz (0x1004)
Primary channel: 4
HT Capabilities:
Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ]
VHT Capabilities:
Supported VHT (tx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
Supported VHT (rx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
Interference Level: Acceptable
Mode : AP Only
Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PSM SGI STBC MUBF Tx rate Rx rate Connect Time
SSID: "xxxx@unifi_5G"
RSSI: 0 dBm SNR: 0 dB noise: -87 dBm Channel: 44/80
BSSID: 4C:ED:FB:AA:3E:E4 Capability: ESS
Supported Rates: [ 6(b) 9 12(b) 18 24(b) 36 48 54 ]
VHT Capable:
Chanspec: 5GHz channel 42 80MHz (0xe22a)
Primary channel: 44
HT Capabilities:
Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ]
VHT Capabilities:
Supported VHT (tx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
NSS: 4 MCS: 0-11
Supported VHT (rx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
NSS: 4 MCS: 0-11
Interference Level: Acceptable
Mode : AP Only
Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PSM SGI STBC MUBF Tx rate Rx rate Connect Time
D4:25:8B:DA:0A:B6 Yes Yes -38dBm No Yes Yes No 433.3M 433.3M 00:00:41
iperf result (iperf server run from PC with Gigabit wired LAN):
C:\iperf-3.1.3-win64>iperf3 -c 192.168.50.166
Connecting to host 192.168.50.166, port 5201
[ 4] local 192.168.50.146 port 57009 connected to 192.168.50.166 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 24.2 MBytes 203 Mbits/sec
[ 4] 1.00-2.00 sec 26.5 MBytes 222 Mbits/sec
[ 4] 2.00-3.00 sec 26.6 MBytes 223 Mbits/sec
[ 4] 3.00-4.00 sec 25.6 MBytes 215 Mbits/sec
[ 4] 4.00-5.00 sec 26.2 MBytes 220 Mbits/sec
[ 4] 5.00-6.00 sec 26.1 MBytes 219 Mbits/sec
[ 4] 6.00-7.00 sec 26.5 MBytes 222 Mbits/sec
[ 4] 7.00-8.00 sec 26.5 MBytes 223 Mbits/sec
[ 4] 8.00-9.00 sec 26.4 MBytes 221 Mbits/sec
[ 4] 9.00-10.00 sec 26.6 MBytes 223 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 261 MBytes 219 Mbits/sec sender
[ 4] 0.00-10.00 sec 261 MBytes 219 Mbits/sec receiver
iperf Done.
wireles log:
CODE
SSID: "xxxx@unifi"
RSSI: 0 dBm SNR: 0 dB noise: -92 dBm Channel: 4
BSSID: 4C:ED:FB:AA:3E:E0 Capability: ESS ShortSlot
Supported Rates: [ 1(b) 2(b) 5.5(b) 6 9 11(b) 12 18 24 36 48 54 ]
VHT Capable:
Chanspec: 2.4GHz channel 4 20MHz (0x1004)
Primary channel: 4
HT Capabilities:
Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ]
VHT Capabilities:
Supported VHT (tx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
Supported VHT (rx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
Interference Level: Acceptable
Mode : AP Only
Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PSM SGI STBC MUBF Tx rate Rx rate Connect Time
SSID: "xxxx@unifi_5G"
RSSI: 0 dBm SNR: 0 dB noise: -87 dBm Channel: 44/80
BSSID: 4C:ED:FB:AA:3E:E4 Capability: ESS
Supported Rates: [ 6(b) 9 12(b) 18 24(b) 36 48 54 ]
VHT Capable:
Chanspec: 5GHz channel 42 80MHz (0xe22a)
Primary channel: 44
HT Capabilities:
Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ]
VHT Capabilities:
Supported VHT (tx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
NSS: 4 MCS: 0-11
Supported VHT (rx) Rates:
NSS: 1 MCS: 0-11
NSS: 2 MCS: 0-11
NSS: 3 MCS: 0-11
NSS: 4 MCS: 0-11
Interference Level: Acceptable
Mode : AP Only
Stations List
----------------------------------------
idx MAC Associated Authorized RSSI PSM SGI STBC MUBF Tx rate Rx rate Connect Time
D4:25:8B:DA:0A:B6 Yes Yes -38dBm No Yes Yes No 433.3M 433.3M 00:00:41
iperf result (iperf server run from PC with Gigabit wired LAN):
CODE
C:\iperf-3.1.3-win64>iperf3 -c 192.168.50.166
Connecting to host 192.168.50.166, port 5201
[ 4] local 192.168.50.146 port 57009 connected to 192.168.50.166 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 24.2 MBytes 203 Mbits/sec
[ 4] 1.00-2.00 sec 26.5 MBytes 222 Mbits/sec
[ 4] 2.00-3.00 sec 26.6 MBytes 223 Mbits/sec
[ 4] 3.00-4.00 sec 25.6 MBytes 215 Mbits/sec
[ 4] 4.00-5.00 sec 26.2 MBytes 220 Mbits/sec
[ 4] 5.00-6.00 sec 26.1 MBytes 219 Mbits/sec
[ 4] 6.00-7.00 sec 26.5 MBytes 222 Mbits/sec
[ 4] 7.00-8.00 sec 26.5 MBytes 223 Mbits/sec
[ 4] 8.00-9.00 sec 26.4 MBytes 221 Mbits/sec
[ 4] 9.00-10.00 sec 26.6 MBytes 223 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 261 MBytes 219 Mbits/sec sender
[ 4] 0.00-10.00 sec 261 MBytes 219 Mbits/sec receiver
iperf Done.