[Pdns-users] still more performance issues

Norbert Sendetzky norbert at linuxnetworks.de
Thu Feb 26 16:09:53 UTC 2004

Hash: SHA1

On Thursday 26 February 2004 16:05, Ken Scott wrote:
> I'm using redhat 9.1, with 256 mb ram and a 233p1.
> mysql is the backend, with the pdns recursor running.
> Question/answer latency: 12.8ms
> 12.8ms is just way too much latency, I mean i old dns server was
> just windows port of Bind running on an old NT4 box. I find it hard
> to imagin that is a better setup then pdns.

12ms latency is a normal value if the answer to the question isn't 
already in cache. Keep the database and connection overhead in mind.
On the other side, I get ca. 3ms latency if the question can be 
answered out of the packet cache.

Bind loads everything in memory before answering a single question and 
that's why it also needs only 3-4ms. The downside is that it's a 
memory hog.

You have two options:
- - Either you increase the ttl values in pdns.conf drastically
- - or use the bindbackend, which does the same as BIND


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