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by c0l0 642 days ago
> if you can share anything related to your sweetspot

For Broadwell in particular, it is enough to avoid power states lower than C1E, in my experience.

And no, MTU plays no part in the degraded IPv6 performance. I think it's rooted in a less efficient route lookup mechanism (Linux 6.7 was what I tested with), but I did not take the time to check properly.