[Pdns-users] question about PDNS - performance

Owen Borseth owen at domainsite.com
Tue Feb 22 21:14:29 UTC 2005

I'm running it on Red Hat Enterprise 3 and I have one still running on 
Fedora Core 2.

- owen

Dan Clark wrote:

> 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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>>> Pdns-users at mailman.powerdns.com
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