diff options
| author | Thomas Higdon <tph@fb.com> | 2019-09-13 23:23:35 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-09-16 16:26:11 +0200 |
| commit | 8f7baad7f03543451af27f5380fc816b008aa1f2 (patch) | |
| tree | 6bf8b48edf5926cfb1b372f611d41fffe872d237 /net | |
| parent | f9af2dbbfe01def62765a58af7fbc488351893c3 (diff) | |
tcp: Add snd_wnd to TCP_INFO
Neal Cardwell mentioned that snd_wnd would be useful for diagnosing TCP
performance problems --
> (1) Usually when we're diagnosing TCP performance problems, we do so
> from the sender, since the sender makes most of the
> performance-critical decisions (cwnd, pacing, TSO size, TSQ, etc).
> From the sender-side the thing that would be most useful is to see
> tp->snd_wnd, the receive window that the receiver has advertised to
> the sender.
This serves the purpose of adding an additional __u32 to avoid the
would-be hole caused by the addition of the tcpi_rcvi_ooopack field.
Signed-off-by: Thomas Higdon <tph@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 4cf58208270e..79c325a07ba5 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3297,6 +3297,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info) info->tcpi_dsack_dups = tp->dsack_dups; info->tcpi_reord_seen = tp->reord_seen; info->tcpi_rcv_ooopack = tp->rcv_ooopack; + info->tcpi_snd_wnd = tp->snd_wnd; unlock_sock_fast(sk, slow); } EXPORT_SYMBOL_GPL(tcp_get_info); |