Hi Alan,

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We are using Radius 2.2.1. Can we fix the child hung by putting any patch ?

For my understanding of Radius server behavior

May I know the possible root causes for "Child is hung" ?

In our scenario, I believe that when backlog is growing, some point of time each request faces "max_request_time" - out so it is giving child is hung message i.e. the request is in queue but no worker thread has picked it.

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> Please let me know whether it is a good idea to set the max_request to
> 3000 so that radius server will not face "child is hung" and no need to
> restart the server to resolve the same.

It doesn't solve the problem. It just delays the problem.

May I know why we will not be able to solve and it will delays the problem please?

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On Fri, Nov 21, 2014 at 10:28 PM, Alan DeKok <aland@deployingradius.com> wrote:

srithar jeevadurai wrote:
> Radius server take radius request and only for accouting request (not
> for access), it will send it to another module via TCP/IP (local server)
> and the module to convert it to diameter request to send it to IN server.
> The same module will response to Radius server for any response comes
> from IN.
>
> So Radius server can support only 100 TPS at max.

Then don't send more that 100 TPS to the RADIUS server. Otherwise, it
won't work.

> Because when radius server faces "child is hung", we need to restart to
> bring it normal.

For v2, please try the v2.x.x branch. I've put a patch in which may
help this.

> Please let me know whether it is a good idea to set the max_request to
> 3000 so that radius server will not face "child is hung" and no need to
> restart the server to resolve the same.

It doesn't solve the problem. It just delays the problem.

Alan DeKok.
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Regards,
Srithar Durairaj
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