/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)