Packet loss on Ros2 eloquent

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I am using eloquent on Ubuntu 18.04 and there will be packet loss when transmitting large data(~1Mb) in the same machine. I guess it is related to 64k fragment on fastdds layer.

I have tried,

• Reliable qos, which may cause big latency.
• share memory, eloquent with fastdds 1.9 does not have shm transport.
• enlarge socket buffer, seems does not work.

I am wondering what I could do to solve it. Thanks for your help in advance.