From 6491a2d26c0878d6063eda2c0ace1b24d6b2dba5 Mon Sep 17 00:00:00 2001 From: Yuchung Cheng Date: Mon, 1 Oct 2018 15:42:32 -0700 Subject: [PATCH] tcp: start receiver buffer autotuning sooner [ Upstream commit 041a14d2671573611ffd6412bc16e2f64469f7fb ] Previously receiver buffer auto-tuning starts after receiving one advertised window amount of data. After the initial receiver buffer was raised by patch a337531b942b ("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: a337531b942b ("tcp: up initial rmem to 128KB and SYN rwin to around 64KB") Signed-off-by: Yuchung Cheng Signed-off-by: Wei Wang Signed-off-by: Neal Cardwell Signed-off-by: Eric Dumazet Reviewed-by: Soheil Hassas Yeganeh Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/ipv4/tcp_input.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 0e2b07be0858..57e8dad956ec 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -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;