IMX6S: Gigabit network problems

woojoongi — Fri, 28 Jul 2023 01:08:08 GMT

We are using IMX6 custom board and latest yocto BSP from freescale (i.MX Linux Yocto Project BSP 5.10.72_2.2.0 Release)

Why does the speed of a wired network change when the wifi dongle driver is installed?

1. I measured the network speed using iperf3 after booting.

- The wired ethernet speed is about 300mbps.

2. Insert usb realtek wifi dongle (rtl8822bu)

- The wired ethernet speed is about 450mbps.

3. Even after removing the wifi dongle, the speed is maintained.

- The wired ethernet speed is about 450mbps.

// eth0 test

Connecting to host 192.168.2.200, port 5201
[ 5] local 192.168.2.11 port 49106 connected to 192.168.2.200 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.03 sec 36.2 MBytes 296 Mbits/sec 0 157 KBytes
[ 5] 1.03-2.01 sec 35.0 MBytes 299 Mbits/sec 0 157 KBytes
[ 5] 2.01-3.03 sec 36.2 MBytes 298 Mbits/sec 0 167 KBytes
[ 5] 3.03-4.02 sec 35.0 MBytes 297 Mbits/sec 0 167 KBytes
[ 5] 4.02-5.00 sec 35.0 MBytes 298 Mbits/sec 0 175 KBytes
[ 5] 5.00-6.02 sec 36.2 MBytes 299 Mbits/sec 0 175 KBytes
[ 5] 6.02-7.01 sec 35.0 MBytes 298 Mbits/sec 0 199 KBytes
[ 5] 7.01-8.02 sec 36.2 MBytes 299 Mbits/sec 0 219 KBytes
[ 5] 8.02-9.01 sec 35.0 MBytes 297 Mbits/sec 0 219 KBytes
[ 5] 9.01-10.03 sec 36.2 MBytes 299 Mbits/sec 0 219 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.03 sec 356 MBytes 298 Mbits/sec 0 sender
[ 5] 0.00-10.03 sec 356 MBytes 298 Mbits/sec receiver

We are using IMX6 custom board and latest yocto BSP from freescale (i.MX Linux Yocto Project BSP 5.10.72_2.2.0 Release)

// only Insert usb realtek wifi dongle

// eth0 test, not use wifi

[ 5] local 192.168.2.11 port 36390 connected to 192.168.2.200 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.02 sec 56.2 MBytes 463 Mbits/sec 0 214 KBytes
[ 5] 1.02-2.00 sec 55.0 MBytes 469 Mbits/sec 0 214 KBytes
[ 5] 2.00-3.02 sec 55.0 MBytes 455 Mbits/sec 0 214 KBytes
[ 5] 3.02-4.02 sec 55.0 MBytes 460 Mbits/sec 0 214 KBytes
[ 5] 4.02-5.00 sec 53.8 MBytes 459 Mbits/sec 0 214 KBytes
[ 5] 5.00-6.00 sec 56.2 MBytes 471 Mbits/sec 0 214 KBytes
[ 5] 6.00-7.00 sec 56.2 MBytes 471 Mbits/sec 0 214 KBytes
[ 5] 7.00-8.01 sec 56.2 MBytes 471 Mbits/sec 0 214 KBytes
[ 5] 8.01-9.01 sec 56.2 MBytes 471 Mbits/sec 0 214 KBytes
[ 5] 9.01-10.01 sec 56.2 MBytes 470 Mbits/sec 0 214 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.01 sec 556 MBytes 466 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 556 MBytes 466 Mbits/sec receiver

iperf Done.

Thank you

Re: IMX6S: Gigabit network problems

Chavira — Fri, 28 Jul 2023 19:39:56 GMT

Hi @woojoongi!

Thank you for contacting NXP Support!

I recommend doing the test directly with another device and not through the modem.

I obtain better results doid the test with two boards connected via ethernet

I don't sure what could be in your custom board because our evks works fine.

If the problem persists, please try to update the kernel to your board the actual kernel is 6.1.22

Best Regards!

Chavira

i.MX ProcessorsのトピックIMX6S: Gigabit network problems

IMX6S: Gigabit network problems

Re: IMX6S: Gigabit network problems