Performance hit on Query logging

[CT]

On 10/07/2010 05:40 PM, Eivind Olsen wrote:
> --On 7. oktober 2010 16.55.54 -0500 groups <groups at obsd.us> wrote:
>> One party thinks that disabling query logging will give enormous
>> performance gains, while 30% is a lot.. IMHO it is very negligible in CPU
>> cycles when the named process only is taking up > 10% CPU..
>> and less than 10% in RAM...
>> Just looking for any suggested tests..
>
> I'm not an expert on this, so take whatever I say here with a grain of
> salt :D
>
> You could run some dnsperf / resperf
> (<http://www.nominum.com/resources/measurement-tools>) ?
> Do some runs without query logging, then some with it enabled. Do the
> tests in the same way. A rather static way of doing it would be to run
> resperf against something you _know_ you have in your cache (like,
> looking up "localhost" or the reverse of 127.0.0.1 or whatever). Do it
> from the same server, or from another server in the same subnet, so you
> avoid network performance.
> resperf has a report tool which can easily make some nice graphs for
> you, showing when BIND starts to struggle with sending the replies, and
> another graph to tell you the latency / delay in replies.
> This should give you some numbers, to see how much query logging would
> impact you.
>
> Regards
> Eivind Olsen
>
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Eivind

My servers run on ESX , wo I can clone the prod box and configure the 
tools..

Thank you for the link.. and response.

Charles