Swoole 用tcp自带的keep alive 不起作用

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

回复内容：

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