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Thunderbolt speed between M1 and M1 Max is x10 slower than M1/M1 MAX <-> Intel

I'm transferring data between M1 ( Big Sur, 16GB ) and M1 MAX ( Monterey, 64GB)

using thunderbolt bridge.

Speed is quite slow around 35 MB/s

Trying M1 < -> Catalina Intel is fast 300-800MB

M1 MAX <-> Catalina Intel is fast as well

I don't want to update M1 to Monterey yet. Any advice?

I've tried sudo sysctl -w net.inet.tcp.tso=0 and Jumbo packets, neither had any effect.

Any advise?

Thanks!

Posted on Oct 27, 2021 1:12 AM

Best reply

Alex Telitsine Author

Level 1

9 points

Posted on Oct 27, 2021 1:19 AM

Solved,

Issue is with second/lower port on M1

Port 1 closer to LCD screen give full speed. strange!

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Thunderbolt speed between M1 and M1 Max is x10 slower than M1/M1 MAX <-> Intel

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