Comment by dpw

Indeed. Kernel-bypass networking is great when you are building something that just receives and send packets (and maybe does other things that can be moved to other threads within the same process using lightweight synchronization mechanisms). It's not great when you want to interact with other processes, because then you have to go through the kernel anyway. And if you have to go through the kernel anyway, the fastest approach is to do as much as you reasonably can in the kernel.