lvs+keepalived+dr+nginx反向代理架构，lvs访问网站很慢

lvs+keepalived+dr+nginx反向代理架构，lvs访问网站很慢。
之后我把lvs去掉，直接让用户通过nginx反向代理去访问站点，就恢复正常了。我就是找不出哪里是什么原因导致速度过慢了。请教各位朋友帮帮我：
配置文件如下：
! Configuration File for keepalived

global_defs {
router_id LVS_MASTER
}
vrrp_sync_group http {
group {
nginx
}
}

vrrp_instance nginx {
state MASTER
interface eth1
virtual_router_id 51
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
111.111.111.111
}
}
virtual_server 111.111.111.111 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP

real_server 111.111.111.112 80 {
weight 2
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}

real_server 111.111.111.113 80 {
weight 2
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}