TCPLIKE_NUMDUPACK
if (_chop_cwndvector(cb, lastok-TCPLIKE_NUMDUPACK)) {
if (lastok-TCPLIKE_NUMDUPACK > cb->oldcwnd_ts) {
if (cb->ack_miss && ((cb->ack_miss + TCPLIKE_NUMDUPACK) < cb->ack_last)) {