what is the bandwidth of the datachannel under Local Network?

[pppaulpeter]

Hi Louis,

may i know have you test the bandwidth of the datachannel with libdatachannel? have you test it under arm device like raspberry pi4? it seems there is limitation in sctp library. this is the issue on sctp library
sctplab/usrsctp#245
@paullouisageneau

[paullouisageneau]

Locally data channel throughput will CPU-limited, mostly because of encryption. SCTP was a CPU bottleneck earlier because it had to calculate CRC32, however this is not the case anymore.

In practice between two desktop computers a data channel should be able to reach 700Mbit/s to 1Gbit/s with libdatachannel built in release mode provided the local network is fast enough, but it depends on the crypto library (from my experience it is significantly faster with GnuTLS than with OpenSSL). Of course throughput will be lower if one side is a less powerful machine or runs WebRTC in a browser.

[pppaulpeter]

Locally data channel throughput will CPU-limited, mostly because of encryption. SCTP was a CPU bottleneck earlier because it had to calculate CRC32, however this is not the case anymore.

In practice between two desktop computers a data channel should be able to reach 700Mbit/s to 1Gbit/s with libdatachannel built in release mode provided the local network is fast enough, but it depends on the crypto library (from my experience it is significantly faster with GnuTLS than with OpenSSL). Of course throughput will be lower if one side is a less powerful machine or runs WebRTC in a browser.

Hi Louis,
thanks for your reply, have you test it on any embedded device?

[paullouisageneau]

thanks for your reply, have you test it on any embedded device?

From experience, on a Raspberry Pi 4 it can send close to 100Mbit/s, it's limited by encryption. It should be way faster on Raspberry Pi 5 which has hardware cryptography extensions.