TCP_SYN_RETRIES    16 net/dccp/timer.c int  sysctl_dccp_request_retries	__read_mostly = TCP_SYN_RETRIES;
TCP_SYN_RETRIES  2670 net/ipv4/tcp_ipv4.c 	net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES;