Commit 041a14d2 authored Oct 01, 2018 by Yuchung Cheng Committed by David S. Miller Oct 01, 2018

tcp: start receiver buffer autotuning sooner



Previously receiver buffer auto-tuning starts after receiving
one advertised window amount of data. After the initial receiver
buffer was raised by patch a337531b ("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: a337531b ("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>

parent d96112b2

net/ipv4/tcp_input.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

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