From ed08495c31bb991de636d2488abaa50b39f2ff4a Mon Sep 17 00:00:00 2001 From: Yuchung Cheng Date: Mon, 22 Jul 2013 16:20:48 -0700 Subject: [PATCH] tcp: use RTT from SACK for RTO If RTT is not available because Karn's check has failed or no new packet is acked, use the RTT measured from SACK to estimate the RTO. The sender can continue to estimate the RTO during loss recovery or reordering event upon receiving non-partial ACKs. This also changes when the RTO is re-armed. Previously it is only re-armed when some data is cummulatively acknowledged (i.e., SND.UNA advances), but now it is re-armed whenever RTT estimator is updated. This feature is particularly useful to reduce spurious timeout for buffer bloat including cellular carriers [1], and RTT estimation on reordering events. [1] "An In-depth Study of LTE: Effect of Network Protocol and Application Behavior on Performance", In Proc. of SIGCOMM 2013 Signed-off-by: Yuchung Cheng Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index b85bc7c3736a..b61274b666f6 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2800,8 +2800,8 @@ static void tcp_fastretrans_alert(struct sock *sk, const int acked, tcp_xmit_retransmit_queue(sk); } -static inline void tcp_ack_update_rtt(struct sock *sk, const int flag, - s32 seq_rtt) +static inline bool tcp_ack_update_rtt(struct sock *sk, const int flag, + s32 seq_rtt, s32 sack_rtt) { const struct tcp_sock *tp = tcp_sk(sk); @@ -2813,6 +2813,9 @@ static inline void tcp_ack_update_rtt(struct sock *sk, const int flag, if (flag & FLAG_RETRANS_DATA_ACKED) seq_rtt = -1; + if (seq_rtt < 0) + seq_rtt = sack_rtt; + /* RTTM Rule: A TSecr value received in a segment is used to * update the averaged RTT measurement only if the segment * acknowledges some new data, i.e., only if it advances the @@ -2823,13 +2826,14 @@ static inline void tcp_ack_update_rtt(struct sock *sk, const int flag, seq_rtt = tcp_time_stamp - tp->rx_opt.rcv_tsecr; if (seq_rtt < 0) - return; + return false; tcp_rtt_estimator(sk, seq_rtt); tcp_set_rto(sk); /* RFC6298: only reset backoff on valid RTT measurement. */ inet_csk(sk)->icsk_backoff = 0; + return true; } /* Compute time elapsed between (last) SYNACK and the ACK completing 3WHS. */ @@ -2840,7 +2844,7 @@ static void tcp_synack_rtt_meas(struct sock *sk, struct request_sock *req) if (tp->lsndtime && !tp->total_retrans) seq_rtt = tcp_time_stamp - tp->lsndtime; - tcp_ack_update_rtt(sk, FLAG_SYN_ACKED, seq_rtt); + tcp_ack_update_rtt(sk, FLAG_SYN_ACKED, seq_rtt, -1); } static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight) @@ -2929,7 +2933,7 @@ static u32 tcp_tso_acked(struct sock *sk, struct sk_buff *skb) * arrived at the other end. */ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, - u32 prior_snd_una) + u32 prior_snd_una, s32 sack_rtt) { struct tcp_sock *tp = tcp_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); @@ -3019,6 +3023,10 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, if (skb && (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) flag |= FLAG_SACK_RENEGING; + if (tcp_ack_update_rtt(sk, flag, seq_rtt, sack_rtt) || + (flag & FLAG_ACKED)) + tcp_rearm_rto(sk); + if (flag & FLAG_ACKED) { const struct tcp_congestion_ops *ca_ops = inet_csk(sk)->icsk_ca_ops; @@ -3028,9 +3036,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, tcp_mtup_probe_success(sk); } - tcp_ack_update_rtt(sk, flag, seq_rtt); - tcp_rearm_rto(sk); - if (tcp_is_reno(tp)) { tcp_remove_reno_sacks(sk, pkts_acked); } else { @@ -3339,7 +3344,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) /* See if we can take anything off of the retransmit queue. */ acked = tp->packets_out; - flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una); + flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una, sack_rtt); acked -= tp->packets_out; if (tcp_ack_is_dubious(sk, flag)) { -- 2.20.1