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tcp: Do not underestimate rwnd_limited

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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: 5615f88614 ("tcp: instrument how long TCP is limited by receive window")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-12-05 14:24:31 -08:00 committed by David S. Miller
parent e37d05a538
commit 41727549de
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
net/ipv4/tcp_output.c
View file

@ -2356,9 +2356,12 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
} else { } else {
if (!push_one && if (!push_one &&
tcp_tso_should_defer(sk, skb, &is_cwnd_limited, tcp_tso_should_defer(sk, skb, &is_cwnd_limited,
max_segs)) max_segs)) {
if (!is_cwnd_limited)
is_rwnd_limited = true;
break; break;
} }
}
limit = mss_now; limit = mss_now;
if (tso_segs > 1 && !tcp_urg_mode(tp)) if (tso_segs > 1 && !tcp_urg_mode(tp))