diff options
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index b74444cee24d..d3545d0cff75 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1514,6 +1514,18 @@ static void tcp_cwnd_validate(struct sock *sk, bool is_cwnd_limited) if (sysctl_tcp_slow_start_after_idle && (s32)(tcp_time_stamp - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto) tcp_cwnd_application_limited(sk); + + /* The following conditions together indicate the starvation + * is caused by insufficient sender buffer: + * 1) just sent some data (see tcp_write_xmit) + * 2) not cwnd limited (this else condition) + * 3) no more data to send (null tcp_send_head ) + * 4) application is hitting buffer limit (SOCK_NOSPACE) + */ + if (!tcp_send_head(sk) && sk->sk_socket && + test_bit(SOCK_NOSPACE, &sk->sk_socket->flags) && + (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) + tcp_chrono_start(sk, TCP_CHRONO_SNDBUF_LIMITED); } } |