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Commit 4d846f02 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: fix tcp_grow_window() for large incoming frames 



tcp_grow_window() has to grow rcv_ssthresh up to window_clamp, allowing
sender to increase its window.

tcp_grow_window() still assumes a tcp frame is under MSS, but its no
longer true with LRO/GRO.

This patch fixes one of the performance issue we noticed with GRO on.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Tom Herbert <therbert@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 48159f00

net/ipv4/tcp_input.c

+1 −0
Original line number Diff line number Diff line
@@ -335,6 +335,7 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb) 
			incr = __tcp_grow_window(sk, skb);



		if (incr) {

			incr = max_t(int, incr, 2 * skb->len);

			tp->rcv_ssthresh = min(tp->rcv_ssthresh + incr,

					       tp->window_clamp);

			inet_csk(sk)->icsk_ack.quick |= 1;