...so you'd rather implement your own congestion control, your own windowing, your own reordering and reassembly, rather than just using TCP and letting the ker

...so you'd rather implement your own congestion control, your own windowing, your own reordering and reassembly, rather than just using TCP and letting the kernel do all that for you? To send a single file? And hopefully this self-made congestion control cooperates with the rest of the traffic on your connection. It doesn't sound to me like your use case would buy you much over TCP with selective ACK. Either way you have to resend dropped packets and ultimately reorder things. For a use case like HTTP/2 with multiple "channels" I could see a reason to avoid head-of-line blocking (though I'd rather just use SCTP), but for a single file?