haproxy with many high Send-Q state

[张伟]

Hi. I encounter a problem when using haproxy. Can you give me some advice?


Here is the problem:
There are many connections with high send-q state. 457/(8701/2) is almost 10%. 
This only happens between haproxy and clients. 
ubuntu@ip-172-31-19-218:/var/log$ sudo netstat -apn|grep haproxy|awk '{if($3>0) 
print $0}'|wc -l; sudo netstat -apn|grep haproxy|wc -l
457
8701










 My haproxy config:

ubuntu@ip-172-31-19-218:/var/log$ cat /etc/haproxy/haproxy.cfg

global

    daemon

    maxconn 200000

    log 127.0.0.1 local0




defaults

    maxconn 200000

    timeout connect 5000

    timeout client  300000

    timeout server 300000




listen bingo

    bind *:8235

    mode tcp

    option tcplog

    log global

    balance roundrobin

    default_backend nodes







backend nodes

    server s11 172.31.20.23:8237

    .......