taglinefilesource code
ssthresh228include/net/sock.hvolatile unsigned short  ssthresh;
ssthresh407net/ipv4/tcp_input.cnewsk->ssthresh = 0;
ssthresh687net/ipv4/tcp_input.cif (sk->cong_window < sk->ssthresh)  
ssthresh739net/ipv4/tcp_input.csk->ssthresh = max(sk->cong_window >> 1, 2);
ssthresh740net/ipv4/tcp_input.csk->cong_window = sk->ssthresh+MAX_DUP_ACKS+1;
ssthresh761net/ipv4/tcp_input.csk->cong_window = sk->ssthresh;
ssthresh101net/ipv4/tcp_timer.csk->ssthresh = sk->cong_window >> 1; /* remember window where we lost */