TCP receiving window size higher than net.core.rmem_max

Question

I am running iperf measurements between two servers, connected through 10Gbit link. I am trying to correlate the maximum window size that I observe with the sys

Answer 1

net.ipv4.tcp_rmem takes precedence net.core.rmem_max according to https://serverfault.com/questions/734920/difference-between-net-core-rmem-max-and-net-ipv4-tcp-rmem:

It seems that the tcp-setting will take precendence over the common max setting

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But I agree with what you say, this seems to conflict with what's written in man tcp, and I can reproduce your findings. Maybe the documentation is wrong? Please find out and comment!