You may further be interested in Bind statistics for analysis of the
Bind server behaviour under load. Look at an example here what metrics
are avialable in general:

https://github.com/lukas999/bind2pmda

If you wanted to use even the PMDA, forget the github source as the PMDA
is now part of the Performance CoPilot (pcp.io).

Overall, it would be good, if you did some basic checks:
 - per thread utilization of the CPU
 - how do the errors start to demostrate when you get over the maximum
 throughput you achieved (timeouts?, errors?)
 - how about the socket count? Is is close to the exhaustion?

Then, the conditions of your test may be of interest:
 - what kind of queries do you use for you test (A, TXT, AAA, UPDATE
 ... ?)
 - what load generator do you use and how does it behave (e.g. in the
 range from dig in loop to asynchronous handling)?

  Best regards

  Lukas

Paul Kosinski <b...@iment.com> writes:

> Google search for "man named" turns up:
>
>   https://ftp.isc.org/isc/bind9/cur/9.9/doc/arm/man.named.html
>
> which says (among more details):
>
>   named [-4] [-6] [-c config-file] [-d debug-level] [-E engine-name] [-f]
>     [-g] [-M option] [-m flag] [-n #cpus] [-p port] [-s] [-S #max-socks]
>     [-t directory] [-U #listeners] [-u user] [-v] [-V] [-x cache-file]
>
> For more explanation, look at:
>
>   
> https://kb.isc.org/article/AA-01249/0/UDP-Listeners-choosing-the-right-value-for-U-when-starting-named.html
>
>
>
> On Thu, 22 Feb 2018 01:50:22 +0000
> "PENG, JUNAN" <jp2...@att.com> wrote:
>
>> Hi, Paul
>>
>> UDP listeners per interface
>>
>> Do you know how to modify this parameter -- UDP listeners per
>> interface
>>
>> version: BIND 9.10.5-S1 <id:041e344> (Unknown)
>> boot time: Tue, 13 Feb 2018 06:12:53 GMT
>> last configured: Tue, 13 Feb 2018 06:12:53 GMT
>> CPUs found: 4
>> worker threads: 4
>> UDP listeners per interface: 3
>> number of zones: 102
>> debug level: 0
>> xfers running: 0
>> xfers deferred: 0
>> soa queries in progress: 0
>> query logging is OFF
>> recursive clients: 0/900/1000
>> tcp clients: 0/15000
>> server is up and running
>>
>> BR
>> Michael
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