How to send large data using C# UdpClient?

Question

I\'m trying to send a large amount of data (more than 50 MB) using C# UdpClient.

So at first I split the data into 65507 byte blocks and send them in a loop.

Answer 1

For all those people saying to use TCP....are foolishly wrong. Although TCP is reliable and the window maintained by the kernel it's fairly "set and forget" protocol, but when it comes to the guy wanting to use 100% of his throughput, TCP will not do (it throttles too hard, and the wait for an ACK automatically puts at least 50% trashed because of the RTT).

To the original question, you are sending UDP packets nonstop in that for-loop, the window fills up and then any new data is dropped immediately and doesn't even attempt to go on the line. You are also splitting your data too large. I would recommend building your own throttle mechanism that starts off with 2k segments per second, and slowly ramps up. Each "segment" contains a SEQ (sequence identifier for acknowledgements or ACK) and OFF (offset inside the file for this data set). As the data is being tagged, let the server keep track of these tags. When the other side gets them, it stores the SEQ numbers in an ACK list, and any missing SEQ numbers are placed into a NACK timer list, when the timer runs out (if they haven't been received) it moves to a NACK list. The receiver should send 5 or so ACKs from the ACK list along with up to 5 NACKs in a single transmission every couple seconds or so. If the sender receives these messages and there are any NACKs, it should immediately throttle down and resend the missing fragment before continuing. The data that is ACKed can be freed from memory.

Good luck!