topic Re: Low performance in RT 1170 Ethernet in i.MX RT Crossover MCUs

Low performance in RT 1170 Ethernet

balasubramaniyam — Tue, 09 Nov 2021 11:14:41 GMT

Hi,

I'm using i.MX RT1170 EVK kit with evkmimxrt1170_lwip_iperf_enet_qos_bm_cm7 SDK example, in this I can't able to achieve the maximum throughput in 1000Mbps Ethernet connection.

I'm getting nearly 390Mbits/sec for the TCP RX test & 150Mbits/sec for the TCP TX test, and I'm sharing the Iperf test results below

Device side: TCP Server Mode (RX test) Host side: Client Mode	TCP_DONE_SERVER (RX) Local address : 192.168.1.115 Port 5001 Remote address : 192.168.1.3 Port 46816 Bytes Transferred 488503908 Duration (ms) 10005 Bandwidth (kbitpsec) 390607
Device side: TCP Client Mode (TX test) Host side: Server Mode	TCP_DONE_CLIENT (TX) Local address : 192.168.1.115 Port 49154 Remote address : 192.168.1.3 Port 5001 Bytes Transferred 186728184 Duration (ms) 10000 Bandwidth (kbitpsec) 149382

In my use case, I need at least 980Mbits/sec throughput in the Iperf test from the 1Gbps Ethernet chip. Kindly help to achieve the maximum ethernet throughput in i.MX RT1170 EVK

Note:

The Ethernet cable is connected at 1000Mb/s speed, and it is checked on the host side.

Hoping for better guidance.

Thanks and Regards,

Bala

Re: Low performance in RT 1170 Ethernet

FelipeGarcia — Fri, 12 Nov 2021 00:38:44 GMT

Hi Bala,

Please check the following from the readme file, I hope this helps.

To experiment with the receive throughput, try to increase the number of receive buffers.

For LPC platforms, where zero-copy on receive is implemented, the number of buffers is determined by ENET_RXBD_NUM definition.

When using ENET QOS, where zero-copy on receive is not implemented, increase the PBUF_POOL_SIZE in the file lwipopts.h or on command line.

For other platforms, where zero-copy on receive is implemented, it is determined by ENET_RXBUFF_NUM definition.

Also increase the TCP receive window by changing TCP_WND definition in the file lwipopts.h or on command line.

Make sure that TCP_WND is not larger than (number of receive buffers / TCP_MSS).

For RTOS applications, DEFAULT_THREAD_PRIO and TCPIP_THREAD_PRIO values can have effect on maximum throughput as well.

Best regards,

Felipe

Re: Low performance in RT 1170 Ethernet

balasubramaniyam — Wed, 17 Nov 2021 09:28:39 GMT

Hi Felipe,

Thanks for the information, I'll check and update the throughput result

Thanks,
Bala