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tcp: Do not underestimate rwnd_limited 

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
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5
net/ipv4/tcp_output.c
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@ -2356,8 +2356,11 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
} 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;