uwsgi 日志：your server socket listen backlog is limited to 100

Question

服务器环境 ubuntu nginx uwsgi python
uwsgi配置是
`<pidfile>/var/run/nginx.pid</pidfile>

 <processes>2</processes>
 <limit-as>300</limit-as>
 <max-requests>2000</max-requests>`

uwsgi 日志提示：your server socket listen backlog is limited to 100 connections,
请问这个连接数哪里设置？