Running webrtc with BBR

[Gauri Baraskar]

Hi,

I want to study the behaviour of BBR when used for video streaming. I have setup a chrome application using webrtc which does video streaming. My goal is to now change GCC used by webrtc to BBR. Any help on how I can do this?

Thanks in advance!

[Neal Cardwell]

Hi Gauri,

Thanks for posting! I'm sharing a response from my colleague Ian Swett:

"""

GCC uses different congestion control feedback (ie: per-packet timestamps) from QUIC BBR, though ideally it's a superset of QUIC's ACK frame.

But since the interfaces are fairly different, it's a decent bit of work.  However, one could use any of the congestion controllers (ie: BBRv1 and BBRv2) that implement SendAlgorithmInterface if you could convert between WebRTC's feedback and QUIC's interface.  There was some internal work on something similar (Quartc) a while back, but most of the focus was on using QUIC with BBRv1 instead of WebRTC with GoogCC.

BBRv1 had a number of issues for WebRTC, one of them being ProbeRTT.  Another being that it tended to persistently underfill the pipe and not find more bandwidth.  I expect BBRv2 to do better.

"""

best regards,
neal

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[Dave Taht]

There are webrtc implementations of GCC in the pion library, signal's
webrtc implementation (rust), twitch, and galene (go)

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