em_add_int_delay_sysctl
em_add_int_delay_sysctl(sc, "rx_int_delay",
em_add_int_delay_sysctl(sc, "tx_int_delay",
em_add_int_delay_sysctl(sc, "rx_abs_int_delay",
em_add_int_delay_sysctl(sc, "tx_abs_int_delay",
static void em_add_int_delay_sysctl(struct e1000_softc *, const char *,