Memory utilisation problem on busy bind resolver

[TCPWave Customer Care]

Dennis

What's the OS are you are using? What's the compiler version used and
what are the compiler options used to build the binary? How are you
measuring the memory utilization? Does the RSS of named grow over time?

thanks
Sam.

On Wed, 2011-08-10 at 00:31 +1000, Dennis Perisa wrote:
> Hi folks,
> 
> We are running a number of BIND 9.7.3-p3 caching nameservers.  In the
> last couple of months, we've observed the memory utilisation of named
> increasing at a steady rate of 1-2% per day on our busiest resolver
> with no indication of subsiding - on occasion, there have been large
> step increases of 1 GB or so.
> 
> All our other resolvers are configured identically but are behaving
> themselves with memory utilisation remaining at fairly constant
> levels.
> 
> I've looked at all the named logs until my eyeballs have almost fallen
> out of my head but am unable to determine the cause of this.  So I'm
> taking a step back and hoping to get some advice - what else can I do
> to find the cause of this?  Or is it something I simply need to live
> with?
> 
> We're looking at measures such as periodic cache flushes, and tuning
> max-cache-size, max-cache-ttl and max-cache-nttl params to limit
> memory usage, but this may only be treating the symptom and costs us
> extra cpu cycles.
> 
> Regards
> Dennis
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