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

[Yanbao Cui]

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！
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