requests time out (sometimes...)

[sofatime]

No, I was using plain poll(). That was the default and I didn't change that (because I have no idea what the difference is...). I changed that to devpoll() now and it looks like the problem is solved. I did at least 15 config changes with graceful restarts and not once it got blocked and also no timeouts (I am now using the stock admin_php again)!
What is the difference between poll and devpoll? Is there a difference in performance?

 

[mistwang]

I am pretty surprised that poll() fails. Looks like need to check the universal poll event dispatcher.
devpoll has better scalability when you deal concurrent connections >1000.

 

[sofatime]

But devpoll is also ok for smaller operations? Or are there disadvantages?

 

[mistwang]

No, there isn't.