Difference between listen backlog and tcp_max_syn_backlog?

[arnab]

Hi All,
What is the relationship between int listen(int s, int backlog); The
backlog parameter with the tcp_max_syn_backlog param?

If I make backlog present in the system call greater than
tcp_max_syn_backlog what would be the impact?Do I need to increase
tcp_max_syn_backlog also?
Thanks in advance
Regards
Arnab