Inquiry about Multipath Transmission Support in MsQuic

[lion117]

Content:
Hi MsQuic Team,
I'm attempting to implement multipath transmission with MsQuic on Ubuntu 20.04 based on msquic V2.4.8 , aiming to dynamically allocate data transfer ratios between Ethernet and Wi-Fi based on real-time network quality (e.g., RTT, packet loss) for large file transfers. However, I couldn't locate related documentation or demos (e.g., path priority scheduling or network-aware load balancing).

My questions:

​**Does the current open-source version of MsQuic support Multipath QUIC?​
​If not, is there a roadmap for releasing this feature?**​ Any estimated timeline?
​Are there experimental branches or third-party extensions​ that demonstrate multipath capabilities?
Any guidance or code references would be highly appreciated!

[nibanks]

We do not yet support multipath QUIC, nor do we have a timeline to add support officially. There is a draft PR out for it right now from an external contributor that we haven't gotten around to reviewing quite yet though.

[masa-koz]

I'm trying to implement multipath in MsQuic. You can try it from #4724.
Currently, my implementation will not process the datagrams which come from multiple paths concurrently, so I'm not sure that using multipath will improve performance.
If you measure the performance, could you make it public?