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Poor TCP performance on Windows 10 GbE

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I have a desktop with an Intel 9900K and 32GB of RAM.

Attached to it is an Intel x540 10 GbE adapter.

On Linux, iPerf to my server gives me 9.4 Gbps up and down. iPerf to the loopback (localhost) gives me around 42 Gbps on the desktop.

On Windows 10 21H1 same desktop, I get 5 Gbps down and 2.3 Gbps up. iPerf to the loopback yields the same exact numbers.

Anyone got any ideas what is happening here, and thoughts on fixing it? Both OSes are running on bare metal.

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