diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_output.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 5aa600900695..d1676d8a6ed7 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1904,7 +1904,9 @@ static int tso_fragment(struct sock *sk, enum tcp_queue tcp_queue, * This algorithm is from John Heffner. */ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb, - bool *is_cwnd_limited, u32 max_segs) + bool *is_cwnd_limited, + bool *is_rwnd_limited, + u32 max_segs) { const struct inet_connection_sock *icsk = inet_csk(sk); u32 age, send_win, cong_win, limit, in_flight; @@ -1912,9 +1914,6 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb, struct sk_buff *head; int win_divisor; - if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) - goto send_now; - if (icsk->icsk_ca_state >= TCP_CA_Recovery) goto send_now; @@ -1973,10 +1972,27 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb, if (age < (tp->srtt_us >> 4)) goto send_now; - /* Ok, it looks like it is advisable to defer. */ + /* Ok, it looks like it is advisable to defer. + * Three cases are tracked : + * 1) We are cwnd-limited + * 2) We are rwnd-limited + * 3) We are application limited. + */ + if (cong_win < send_win) { + if (cong_win <= skb->len) { + *is_cwnd_limited = true; + return true; + } + } else { + if (send_win <= skb->len) { + *is_rwnd_limited = true; + return true; + } + } - if (cong_win < send_win && cong_win <= skb->len) - *is_cwnd_limited = true; + /* If this packet won't get more data, do not wait. */ + if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) + goto send_now; return true; @@ -2356,11 +2372,8 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle, } else { if (!push_one && tcp_tso_should_defer(sk, skb, &is_cwnd_limited, - max_segs)) { - if (!is_cwnd_limited) - is_rwnd_limited = true; + &is_rwnd_limited, max_segs)) break; - } } limit = mss_now; |