title: too many nginx waiting connections
body: <p>My nginx status below：</p>
  
  <pre><code>Active connections: 1156598
  server accepts handled requests
       429477742 429477742 2435052040 
  Reading: 353 Writing: 45136 Waiting: 1111109 
  </code></pre>
  
  <p>As we can see, there are 1111109 waiting connections.</p>
  
  <p>But with ss -s I only get 24453 tcp connections:</p>
  
  <pre><code>Total: 17618 (kernel 0)
  TCP:   24453 (estab 17007, closed 6489, orphaned 622, synrecv 0, timewait 6466/0), ports 0
  
  Transport Total     IP        IPv6
  *         0         -         -        
  RAW       0         0         0        
  UDP       2         2         0        
  TCP       17964     17961     3        
  INET      17966     17963     3        
  FRAG      0         0         0 
  </code></pre>
  
  <p>The value of Waiting connections is much higher than TCP connections, is it normal?</p>