Multiple sendto() using UDP socket
- by ereOn
Hi,
I have a network software which uses UDP to communicate with other instances of the same program. For different reasons, I must use UDP here.
I recently had problems sending huge ammounts of data over UDP and had to implement a fragmentation system to split my messages into small data chunks. So far, it worked well but I now encounter an issue when I have to send a lot of data chunks.
I have the following algorithm:
Split message into small data chunks (around 1500 bytes)
Iterate over the data chunks list and for each, send it using sendto()
However, when I send a lot of data chunks, the receiver only gets the first 6 messages. Sometimes it misses the sixth and receives the seventh. It depends.
Anyway, sendto() always indicates success. This always happen when I test my software over a loopback interface (127.0.0.1) but never over my LAN network.
If I add something like std::cout << "test" << std::endl; between the sendto() then every frame is received.
I am aware that UDP allows packet loss and that my frames might be loss for a lot of reasons and I suppose it has to do with the rate I am sending the data chunks at.
What would be the right approach here ?
Implementing some acknowledgement mechanism (just like TCP) seems overkill.
Adding some arbitrary waiting time between the sendto() is ugly and will probably decrease performance.
Increasing (if possible) the receiver UDP internal buffer ? I don't even know if this is possible.
Something else ?
I really need your advices here.
Thank very much.
