tsince_hr
calc_rttavg(d, f->t, tsince_hr(f));
calc_rttavg(d, NULL, tsince_hr(f));
} else if (tsince_hr(f) < t->taint * rto(d)) {
since = tsince_hr(f);
if (tsince_hr(f) < timeout)
since = tsince_hr(f);