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Linux: AM335 Linux Ethernet Performance will drop if the packet is <1K

Rio Chan
Genius 16120 points

Part Number: AM3352

Tool/software: Linux

Hi.

If testing with Iperf, and set the packet size <1K, we found the Ethernet Throughput will drop when the packet size is Smaller than 1K.

Set the Packet size <100 bytes, the Throughput will drop >20%.

Any good suggestion to avoid this?

BR Rio

  • 0
    TI__Guru 65405 points
    Hi Rio,

    You are observing expected behavior about ethernet performance not only for Sitara am335x but for the most of devices. The explanation of throughput dropping with decreasing packet size is that when decreasing packet size and would like to have same throughput you need to increase the number of packets which follow increasing CPU load because each one packet should be processed. Higher CPU load is the reason for throughput dropping with decreasing packet size.

    Regards,
    Tsvetolin Shulev