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;