PREF
drp->dr_pref = PREF(drp->dr_recv_pref, ifp);
new_drp->dr_pref = PREF(pref, ifp);
/* [00] */ TNS("prefetch",PREF), TNS("prefetchw",PREF), TNS("prefetchwt1",PREF),INVALID,
case PREF:
/* [0] */ TNS("prefetchnta",PREF),TNS("prefetcht0",PREF), TNS("prefetcht1",PREF), TNS("prefetcht2",PREF),
/* [4] */ INVALID, INVALID, TNSu("prefetchit1",PREF),TNSu("prefetchit0",PREF),