From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuchung Cheng Subject: [PATCH net-next] tcp: send loss probe after 1s if no RTT available Date: Fri, 18 Sep 2015 11:40:33 -0700 Message-ID: <1442601633-28619-1-git-send-email-ycheng@google.com> Cc: netdev@vger.kernel.org, Yuchung Cheng , Nandita Dukkipati , Neal Cardwell , Eric Dumazet To: davem@davemloft.net Return-path: Received: from mail-pa0-f53.google.com ([209.85.220.53]:36406 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753059AbbIRSlA (ORCPT ); Fri, 18 Sep 2015 14:41:00 -0400 Received: by padhk3 with SMTP id hk3so57628585pad.3 for ; Fri, 18 Sep 2015 11:41:00 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: This patch makes TLP to use 1 sec timer by default when RTT is not available due to SYN/ACK retransmission or SYN cookies. Prior to this change, the lack of RTT prevents TLP so the first data packets sent can only be recovered by fast recovery or RTO. If the fast recovery fails to trigger the RTO is 3 second when SYN/ACK is retransmitted. With this patch we can trigger fast recovery in 1sec instead. Note that we need to check Fast Open more properly. A Fast Open connection could be (accepted then) closed before it receives the final ACK of 3WHS so the state is FIN_WAIT_1. Without the new check, TLP will retransmit FIN instead of SYN/ACK. Signed-off-by: Yuchung Cheng Signed-off-by: Nandita Dukkipati Signed-off-by: Neal Cardwell Signed-off-by: Eric Dumazet --- net/ipv4/tcp_output.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index d0ad355..4cd0b50 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2165,7 +2165,7 @@ bool tcp_schedule_loss_probe(struct sock *sk) /* Don't do any loss probe on a Fast Open connection before 3WHS * finishes. */ - if (sk->sk_state == TCP_SYN_RECV) + if (tp->fastopen_rsk) return false; /* TLP is only scheduled when next timer event is RTO. */ @@ -2175,7 +2175,7 @@ bool tcp_schedule_loss_probe(struct sock *sk) /* Schedule a loss probe in 2*RTT for SACK capable connections * in Open state, that are either limited by cwnd or application. */ - if (sysctl_tcp_early_retrans < 3 || !tp->srtt_us || !tp->packets_out || + if (sysctl_tcp_early_retrans < 3 || !tp->packets_out || !tcp_is_sack(tp) || inet_csk(sk)->icsk_ca_state != TCP_CA_Open) return false; @@ -2184,9 +2184,10 @@ bool tcp_schedule_loss_probe(struct sock *sk) return false; /* Probe timeout is at least 1.5*rtt + TCP_DELACK_MAX to account - * for delayed ack when there's one outstanding packet. + * for delayed ack when there's one outstanding packet. If no RTT + * sample is available then probe after TCP_TIMEOUT_INIT. */ - timeout = rtt << 1; + timeout = rtt << 1 ? : TCP_TIMEOUT_INIT; if (tp->packets_out == 1) timeout = max_t(u32, timeout, (rtt + (rtt >> 1) + TCP_DELACK_MAX)); -- 2.6.0.rc0.131.gf624c3d