I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire to wire latency using hardware timestamps, But we are not able to see any difference between DAC cable and SFP+ with fiber.
I have searched the internet but I'm not able to find typical latency of 10G SFP+. The only link I'm able to find is almost 10years old.
Can anyone confirm what is typical latency of SFP+ or how to calculate it?