iwlwifi slowness on Jetson nano

Autonomous Machines Jetson & Embedded Systems Jetson Nano
#1

Hi,
i enabled iwlwifi driver for Intel 9260 and setup AP and everything is working.
When i try to transfer big files (with ssh/scp) the max speed is about 3MB/s.

I tried to disable power save but i can’t :

root@jetson-nano:~# iw dev wlan0 set power_save off
command failed: Operation not supported (-95)

root@jetson-nano:~# iw dev wlan0 get power_save 
Power save: on

i added the patch to dhd_linux.c :

+	dhd_slpauto_config(dhd, 0);
+
 	DHD_ERROR(("Firmware up: op_mode=0x%04x, MAC="MACDBG"\n",
 		dhd->op_mode, MAC2STRDBG(dhd->mac.octet)));
 	/* Set Country code  */

Nothing changed after the patch, any idea about this?

Thanks

#2

This is the test I did on my jetson nano with Intel 8265 NGW.
Could you share more information? the singal, etc will impact the performance.
Have you test within the local env?

root@jetson-nano:~# lspci
00:01.0 PCI bridge: NVIDIA Corporation Device 0fae (rev a1)
00:02.0 PCI bridge: NVIDIA Corporation Device 0faf (rev a1)
01:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 50)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

root@jetson-nano:~# iw dev wlan0  set power_save on
root@jetson-nano:~# iw dev wlan0  get power_save on
Power save: on
root@jetson-nano:~# iw dev wlan0  set power_save off
root@jetson-nano:~# iw dev wlan0  get power_save o
Power save: off
root@jetson-nano:~#

root@jetson-nano:/home/dlinano# iw dev wlan0 link
Connected to b4:de:31:fb:b9:8e (on wlan0)
	SSID: NV_VISITOR
	freq: 5280
	RX: 1308218 bytes (535 packets)
	TX: 39794 bytes (308 packets)
	signal: -68 dBm
	tx bitrate: 650.0 MBit/s VHT-MCS 7 80MHz short GI VHT-NSS 2

	bss flags:	short-slot-time
	dtim period:	1
	beacon int:	100
root@jetson-nano:/home/dlinano#
#3

i can now set power save to off after stopping Hostapd deamon.
also the signal level is not good (antenna not installed), bellow information my PC connected to the setup AP:

IEEE 802.11  ESSID:"test"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: A0:51:0B:5A:F1:7C   
          Bit Rate=1 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=34/70  Signal level=-76 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:29   Missed beacon:0

*       test               Infra  1     54 Mbit/s   50      ▂▄__  --

The Nano Kit is near my PC (5cm) so no need to have antenna, right?
Or it’s linked to the use of 802.11b low bandwidth?

#4

Hi， ahadach

In order to keep a good connection the speed will drop to 5.5Mbps、2Mbps、1Mbps or lower.
You can test with a wireless router with a antenna attached to evaluate the performance.

Mostly the signal of the AP is not good enough and the antenna is always required to keep a good performance.

#5