PFFRAG_FRENT_HIWAT
{ &pf_frent_pl, PFFRAG_FRENT_HIWAT },
pf_pool_limits[PF_LIMIT_FRAGS].limit = PFFRAG_FRENT_HIWAT;
pf->limit[PF_LIMIT_FRAGS] = PFFRAG_FRENT_HIWAT;