I've tried changing the tcp's window size by modifying
net.ipv4.tcp_rmem values, however the changes which I make have no effect on actual window size which I can check using a wireshark.
I tried to do that on 2 different kernels (3.2.69 and 2.6.38) with no effect at all.
I've even tried to change the min/default numbers to an absurd level and disable window_scaling but still no effect - window size remains exactly the same. What do I do wrong?
-- EDIT --
I've updated the kernel to 3.14.57 and the TCP's window size doubled without doing any other change. It looks like this value is controlled somewhere else and kernel actually ignores