4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Eric Dumazet <[email protected]> [ Upstream commit 41727549de3e7281feb174d568c6e46823db8684 ] If available rwnd is too small, tcp_tso_should_defer() can decide it is worth waiting before splitting a TSO packet. This really means we are rwnd limited. Fixes: 5615f88614a4 ("tcp: instrument how long TCP is limited by receive window") Signed-off-by: Eric Dumazet <[email protected]> Acked-by: Soheil Hassas Yeganeh <[email protected]> Reviewed-by: Yuchung Cheng <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/ipv4/tcp_output.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2328,8 +2328,11 @@ static bool tcp_write_xmit(struct sock * } else { if (!push_one && tcp_tso_should_defer(sk, skb, &is_cwnd_limited, - max_segs)) + max_segs)) { + if (!is_cwnd_limited) + is_rwnd_limited = true; break; + } } limit = mss_now;
