配置如下，
'open_tcp_keepalive'=>1
'tcp_keepidle' =>60,
'tcp_keepcount' => 3,
'tcp_keepinterval' =>5,
但是不起作用，怎么办？版本1.8.1stable
配置如下，
'open_tcp_keepalive'=>1
'tcp_keepidle' =>60,
'tcp_keepcount' => 3,
'tcp_keepinterval' =>5,
但是不起作用，怎么办？版本1.8.1stable