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);
         }
 }