Based on an appropriate detection algorithm@ the Eifel response algorithm provides a way for a TCP sender to respond to a detected spurious timeout. It adapts the retransmission timer to avoid further spurious timeouts and (depending on the detection algorithm) can avoid the often unnecessary go-back-N retransmits that would otherwise be sent. In addition@ the Eifel response algorithm restores the congestion control state in such a way that packet bursts are avoided.
RFC 4015-2005 history
2005RFC 4015-2005 The Eifel Response Algorithm for TCP