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UPSTREAM: tcp: start receiver buffer autotuning sooner

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Previously receiver buffer auto-tuning starts after receiving
one advertised window amount of data. After the initial receiver
buffer was raised by patch a337531b94 ("tcp: up initial rmem to
128KB and SYN rwin to around 64KB"), the reciver buffer may take
too long to start raising. To address this issue, this patch lowers
the initial bytes expected to receive roughly the expected sender's
initial window.

Fixes: a337531b94 ("tcp: up initial rmem to 128KB and SYN rwin to around 64KB")
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 041a14d267)
Signed-off-by: Chenbo Feng <fengc@google.com>

This patch is backported from 4.20 to allow us to drop "ANDROID: net:
ipv4: tcp: add a sysctl to config the tcp_default_init_rwnd"

Bug: 118591209
Test: net_test sock_diag_test.py
Change-Id: Ifff58b0b86a816a66d5a0bd77b57d6eedeaafa3b
This commit is contained in:
Yuchung Cheng 2018-10-01 15:42:32 -07:00 committed by Alistair Strachan
parent c4dbd9e931
commit 2ad8e60c88
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -438,7 +438,7 @@ void tcp_init_buffer_space(struct sock *sk)
if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK))
tcp_sndbuf_expand(sk);
tp->rcvq_space.space = tp->rcv_wnd;
tp->rcvq_space.space = min_t(u32, tp->rcv_wnd, TCP_INIT_CWND * tp->advmss);
tcp_mstamp_refresh(tp);
tp->rcvq_space.time = tp->tcp_mstamp;
tp->rcvq_space.seq = tp->copied_seq;