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authorEric Dumazet <edumazet@google.com>2018-11-11 06:41:29 -0800
committerDavid S. Miller <davem@davemloft.net>2018-11-11 13:54:53 -0800
commit1c09f7d073b1d1ce85765c5552e4b40a6b6ba770 (patch)
tree74234c3415f009f5bbe0be7e9dfa81a04e090dab
parent5e13a0d3f5c11df7eb297e6583cf874a79a00374 (diff)
tcp: do not try to defer skbs with eor mark (MSG_EOR)
Applications using MSG_EOR are giving a strong hint to TCP stack : Subsequent sendmsg() can not append more bytes to skbs having the EOR mark. Do not try to TSO defer suchs skbs, there is really no hope. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_output.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 9c34b97d365d..35feadf48030 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1944,6 +1944,10 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
if ((skb != tcp_write_queue_tail(sk)) && (limit >= skb->len))
goto send_now;
+ /* If this packet won't get more data, do not wait. */
+ if (TCP_SKB_CB(skb)->eor)
+ goto send_now;
+
win_divisor = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tso_win_divisor);
if (win_divisor) {
u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);