Recursive bind becomes unresponsive with high load

[Michael Brunnbauer]

Hello Steinar,

On Thu, Mar 31, 2016 at 07:35:39PM +0200, sthaug at nethelp.no wrote:
> Have you checked your operating system limits? One recursive client
> often means one open socket (waiting for response from authoritative
> server), i.e. one open file descriptor. If you have thousands of
> simultaneous recursive clients, you will need a correspondingly large
> file descriptor limit for the named process.
> 
> Remember that a (presumed) authoritative server which is slow to
> answer means that the socket may be held open correspondingly long.

The process can use up to 65536 file descriptors and the failed lookups
also occur in other processes that only do one lookup.

Regards,

Michael Brunnbauer

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