[Pdns-users] Re: PowerDNS performance compared to other nameservers

Markus Welsch markus.welsch at suk.de
Tue Dec 2 16:53:15 UTC 2003

> Have you tried running your test a second time? PowerDNS can be considered a
> 'lazy loader' of zones. The first time you run PowerDNS, the cache is cold
> and all queries need database access.

When speaking of queries, when will database access be made besides the 
first query?

> Secondly, PowerDNS sometimes is very slow on SMP systems. This is a glibc issue.
> Symptoms are massive 'cs' counts in vmstat 1 output caused by spinlocks that
> 'overspin'.
> We tested with .org and saw 50.000 q/s on a tuned setup, so I find 13
> queries/second highly disappointing and three orders of magnitude below what
> I would expect.

Is this tuned configuration available somewhere? :-)
More details on backend (and maybe details about RDBMS), linux 
distribution, hardware would be great :-)

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