TH_MAX
static int default_th_max = TH_MAX;
{ TH_MAX * 2 + TH_MIN, TH_MAX * 3, INV_P_MAX }, /* low drop precedence */
{ TH_MAX + TH_MIN, TH_MAX * 2, INV_P_MAX }, /* medium drop precedence */
{ TH_MIN, TH_MAX, INV_P_MAX } /* high drop precedence */