bandwhich CPU utilization is too high

[handewo]

bandwhich CPU utilization is too higher than iftop
Here is two test case on x86_64 platform:
Case I


Case II

[flxo]

Here is a profile from bandwhich cc5685b captured with samply on a x86_64 Linux ( 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC).

I also used iperf3 (locally).

You see in the profile that bandwhich spends ~70% in recvfrom and ~23% in pselect - both sys calls.