keepalive_intvl   342 include/linux/tcp.h 	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
keepalive_intvl  1428 include/net/tcp.h 	return tp->keepalive_intvl ? : net->ipv4.sysctl_tcp_keepalive_intvl;
keepalive_intvl  3019 net/ipv4/tcp.c 			tp->keepalive_intvl = val * HZ;