[CRIU] [Users] socket will take at least 0.5 seconds to recovery after docker restore done

[Vasily Averin]

Re-addressed to criu mailing list

On 12.07.2015 10:48, Yanbao Cui wrote:
> Hi,
> 
> I am working on the docker checkpoint/restore use CRIU, and the time consuming is the key point we concerned.
> 
> I found a strange phenomenon that the created socket need additional at least 0.5 seconds to reconnect after the docker restore done.
> 
> But if I create a new socket after restoring the docker , it will connect to the peer immediately.
> 
> No matter the connection uses TCP or UDP.
> 
> From the CRIU source code, I found that it will create a new socket with SO_REUSEADDR, and change the original fd to this new one. but I have no idea that why it need more time to recovery.
> 
> Could someone help me to explain it or give me some points?
> 
> Thanks very much!
> 
> -- 
> Best Regards
> Cui Yanbao | 崔言宝
> --
> 龍生玖天，豈能安於凡塵！