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Ysurac / openmptcprouter

OpenMPTCProuter is an open source solution to aggregate multiple internet connections using Multipath TCP (MPTCP) on OpenWrt
https://www.openmptcprouter.com/
GNU General Public License v3.0
1.8k stars 259 forks source link

Link saturation on aggregated bandwidth #3484

Open MB178 opened 1 month ago

MB178 commented 1 month ago

Hello, I have a use case and would like to understand the behavior of OMR in this scenario: If I have two links connected to OMR via eth0 and eth1, and I perform a speed test using omr-test-speed to measure the aggregated bandwidth, then initiate a second speed test on eth0 with omr-test-speed eth0 to saturate that link, how will OMR respond? Specifically, will OMR shift all traffic to the non-saturated link because it will have the lowest latency, causing the aggregated bandwidth to decrease? Alternatively, will the congestion algorithm in OMR attempt to mitigate the issue and manage the traffic distribution to reduce the impact of saturation?

Ysurac commented 1 month ago

OMR will switch the the non satured link. There is multiple TCP Congestion Control available in OMR, BBR3 will help a little. SQM may also be needed in this case to not saturate totally a link.

MB178 commented 1 month ago

Will the aggregated bandwidth decrease?