Why changing value of SO_RCVBUF doesn’t work?

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You may also be limited by the OS, if it still doesn’t seem to be working. Check the values in:

/proc/sys/net/core/rmem_default
/proc/sys/net/core/rmem_max

If it’s TCP as you say in your example, and not actually a raw socket, you can also check the values in:

/proc/sys/net/ipv4/tcp_mem

If you run cat on these files they’ll show you the current settings. To change them permanently, use sysctl. It’s a good idea to write these settings down before you start changing things. Here’s a great tutorial on making those changes: http://fasterdata.es.net/fasterdata/host-tuning/linux/.

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