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tcp: undo init congestion window on false SYNACK timeout

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Linux implements RFC6298 and use an initial congestion window
of 1 upon establishing the connection if the SYNACK packet is
retransmitted 2 or more times. In cellular networks SYNACK timeouts
are often spurious if the wireless radio was dormant or idle. Also
some network path is longer than the default SYNACK timeout. In
both cases falsely starting with a minimal cwnd are detrimental
to performance.

This patch avoids doing so when the final ACK's TCP timestamp
indicates the original SYNACK was delivered. It remembers the
original SYNACK timestamp when SYNACK timeout has occurred and
re-uses the function to detect spurious SYN timeout conveniently.

Note that a server may receives multiple SYNs from and immediately
retransmits SYNACKs without any SYNACK timeout. This often happens
on when the client SYNs have timed out due to wireless delay
above. In this case since the server will still use the default
initial congestion (e.g. 10) because tp->undo_marker is reset in
tcp_init_metrics(). This is an intentional design because packets
are not lost but delayed.

This patch only covers regular TCP passive open. Fast Open is
supported in the next patch.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2019-04-29 15:46:16 -07:00 committed by David S. Miller
parent 9e450c1ecb
commit 336c39a031
2 changed files with 7 additions and 0 deletions
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2
net/ipv4/tcp_input.c
View File

@ -6101,6 +6101,8 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
*/
tcp_rearm_rto(sk);
} else {
tcp_try_undo_spurious_syn(sk);
tp->retrans_stamp = 0;
tcp_init_transfer(sk, BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB);
tp->copied_seq = tp->rcv_nxt;
}

5
net/ipv4/tcp_minisocks.c
View File

@ -522,6 +522,11 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
newtp->rx_opt.ts_recent_stamp = 0;
newtp->tcp_header_len = sizeof(struct tcphdr);
}
if (req->num_timeout) {
newtp->undo_marker = treq->snt_isn;
newtp->retrans_stamp = div_u64(treq->snt_synack,
USEC_PER_SEC / TCP_TS_HZ);
}
newtp->tsoffset = treq->ts_off;
#ifdef CONFIG_TCP_MD5SIG
newtp->md5sig_info = NULL; /*XXX*/