[Pdns-users] question about PDNS - performance

Dan Clark dan at synaptic.net.nz
Tue Feb 22 21:11:52 UTC 2005

I might reinstall on a fresh copy of debian or whatever, what distro do 
you have it installed on?

Owen Borseth wrote:

> We have four servers using PDNS with a shared MySQL back end. Two 
> servers average ~610 qps with ~2ms q/a latency and the other two 
> average ~210 qps with less than 1ms q/a latency. Our cache hit rate is 
> about 96% on all servers. We haven't had any performance issues using 
> PDNS to date.
> This is with PDNS running on IBM blades with 1GB of memory and a 
> single 2.4GHz Xeon. Memory usage for PDNS is minimal, less than 400K, 
> and CPU usage averages ~2.5%.
> I would have to say that I have never been happier with a piece of 
> software in my life than I am with PDNS. It's fast, simple, and 
> relatively maintenance free once you get it up and running.
> There is a caveat to all of this. We were never able to get it running 
> decent on a dual proc kernel. We tried everything we could think of 
> but it would cap out at about 30 qps. I haven't tried it with the 
> latest 2.6 kernel but performance is fine enough so I'm not too 
> concerned.
> - Owen
> Dan Clark wrote:
>> I recently tried powerdns and was pretty astounded that it couldn't 
>> keep up with my 30 odd zones.
>> It could be misconfiguration but I can't get debugging/logging to 
>> work, unless I start the daemon using /etc/init.d/pdns monitor
>> Once I did get it all going, queries took too long to return results 
>> and reverse lookup zones didn't seem to work. Then after a day in 
>> service the box would only answer queries from nslookup/dig on the 
>> box itself and no longer from the interweb as it would time out 
>> before it could answer the query.
>> I'm lost really, why would it do this on a fresh install with very 
>> little zones?
>> Cheers
>> Dan Clark
>> Technical Director
>> Synaptic Ltd
>> Michiel van Es wrote:
>>> Hi,
>>> I am thinking to switch our Bind DNS to Powerdns.
>>> How fast is Powerdns?
>>> We are hosting zones with a large amount of answers/queries per 
>>> minute (at least  20.000 answers per.minute - 500 queries p/m)
>>> This is for 1 zone..we are having 3 or 4 of this kind of customers 
>>> which are having such a large DNS load.
>>> Can PDNS with Mysql (gmysql backend) handle this amount of load easily?
>>> What is the MAX?
>>> I know it is also a hardware  issue but we are currently running 
>>> this load on dual p 3 800 Mhz 512 MB Ram and 2 18,2 GB SCSI disks).
>>> Thanks for some answers/benchmarks results/experiences..
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