Caching issue about sctp HOT 1 CLOSED

Thanks @Antonito - it was nice chatting with you earlier.

Since current SCTP does not have congestion control, it tries to send all the pending data pushed by the application. As network bandwidth is finite, I can image lots of packet loss would be happening if you push large data too fast (probably, the CPU is doing large number of retransmissions also).

Even with proper congestion control is implemented, it is still the application's responsibility to control how fast data has to be pushed to the data channel, which is typically done by monitoring a parameter called "bufferAmount" which is, again, not available yet.

https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel/bufferedAmount

If you push large data at once, SCTP layer would be busy working on appending and sorting the send buffer (payloadQueue), so I can imagine much CPU time is spent for sorting the data a lot.

Once the congestion control is implemented, we should be able to enable bufferedAmount (and other related threshold) parameter, with which the application can control the amount of data to be pushed to the channel.

I will also looking into more efficient way to manage buffered chunks. (append / sorting arrays may not be super efficient).

Relates to #11

from sctp.