bbr_log_type_rwnd_collapse
bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0);
bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0);
bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd);
bbr_log_type_rwnd_collapse(bbr,