From 1c09f7d073b1d1ce85765c5552e4b40a6b6ba770 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 11 Nov 2018 06:41:29 -0800 Subject: [PATCH] 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 Acked-by: Soheil Hassas Yeganeh Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 4 ++++ 1 file changed, 4 insertions(+) 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); -- 2.30.2