From fcd16c0a95a8faf4d310f94d831b22f901c5a744 Mon Sep 17 00:00:00 2001 From: Yuchung Cheng Date: Wed, 12 Aug 2015 11:18:18 -0700 Subject: [PATCH] tcp: don't extend RTO on failed loss probe attempts If TLP was unable to send a probe, it extended the RTO to now + icsk_rto. But extending the RTO makes little sense if no TLP probe went out. With this commit, instead of extending the RTO we re-arm it relative to the transmit time of the write queue head. Signed-off-by: Yuchung Cheng Signed-off-by: Neal Cardwell Signed-off-by: Nandita Dukkipati Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 7d1efa762b75..78fc89c1c43c 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2275,13 +2275,12 @@ void tcp_send_loss_probe(struct sock *sk) tp->tlp_high_seq = tp->snd_nxt; rearm_timer: - inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, - inet_csk(sk)->icsk_rto, - TCP_RTO_MAX); - - if (likely(!err)) - NET_INC_STATS_BH(sock_net(sk), - LINUX_MIB_TCPLOSSPROBES); + if (likely(!err)) { + NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPLOSSPROBES); + /* Reset s.t. tcp_rearm_rto will restart timer from now */ + inet_csk(sk)->icsk_pending = 0; + } + tcp_rearm_rto(sk); } /* Push out any pending frames which were held back due to -- 2.30.2