In the "Raw Ethernet Programming: Basic Introduction - Code Example" post, the code uses IBV_QPT_RAW_PACKET and a steering rule to filter each packet. Will this reduce the bandwidth?

Infrastructure & Networking Software And Drivers
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In my test setup, I am using two MCX515A-CCAT NICs. They are installed in two linux computers which are connected by a single cable (no switch). Previously, when I was running tests like ib_send_bw or ib_write_bw and using UD, UC, or RC transport mode, I was seeing bandwidths ~90Gbps or higher. With the example in Raw Ethernet Programming: Basic introduction, after adding some code to count packets and measure time, I am seeing bandwidths around 10 Gbps. I have been playing with different parameters such as MTU, packet size, or IBV_SEND_INLINE. I am wondering if the reduction in bandwidth is due to the packet filtering being done by the steering rule and the use of IBV_QPT_RAW_PACKET? Or should I expect to see similar bandwidths (~90 Gbps) as in my earlier tests and the problem is one of lack of optimization of my setup?

Thanks for any help you can provide.

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It may because the code you add affect the performance. Could you share the code you added or provide a demo code you used? Thanks.