-P 128 --bidir iperf server-side CPU usage is too high, resulting in low performance

[minimoonleaf]

Version of iperf3: iperf 3.16 (cJSON 1.7.15) (windows ver)

Hardware: CPU: Intel Xeon Silver 4410Y2 Memory: 128GB(DDR5 4000Mhz 16GB32) HBA: Intel E810 100G

Operating system (and distribution, if any): Windows Server 2022

PS:I know there's a note that there won't be Windows support, but since I had the problem I thought I'd raise it here and it's okay if it doesn't work out.

Other relevant information (for example, non-default compilers, libraries, cross-compiling, etc.): https://github.com/ar51an/iperf3-win-builds Please fill out one of the "Bug Report" or "Enhancement Request" sections, as appropriate. Note that submissions of bug fixes, new features, etc. should be done as a pull request at https://github.com/esnet/iperf/pulls

Bug Report Expected Behavior Server CPU usage same as Client CPU usage.

Actual Behavior Server CPU usage 100% Client CPU usage 12% The difference between the two sides is too great, resulting in low performance on the server side.

Steps to Reproduce Server cmd> iperf.exe -s Client cmd> iperf.exe -c IP -P 128 --bidir

Possible Solution Optimize the workflow of iperf -s

Enhancement Request Current behavior

Desired behavior Maximize the performance of bidirectional testing

Implementation notes