RE: [PATCHv6 net-next 20/31] iw_cxgb4: adjust tcp snd/rcv window based on link speed

quoted

Added module option named adjust_win, defaulted to 1, that allows
disabling the 40G window bump.  This allows a user to specify the exact
default window sizes via module options snd_win and rcv_win.

This is terrible.  As is the existing other TCP tweaking module
parameters.

You can just use the TCP settings the kernel already provides for
the real TCP stack.

Do you mean use sysctl_tcp_*mem, sysctl_tcp_timestamps, sysctl_tcp_window_scaling, etc?
I'll look into this.  

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