On Mon, Apr 05, 2021 at 02:40:17PM +0000, Nejedlo, Mark via Pdns-users wrote:
> We recently replaced some Bind servers with PowerDNS recursor, and were
> rather surprised to see CPU usage essentially double for the same workload.
> My expectation was that the load would be more or less equivalent between the
> two resolvers. It looks like the load is centered in the actual
> pdns_recursor worker threads, not the distributor threads or dnsdist. Is it
> expected that CPU usage would be so much higher under PowerDNS? Is there a
> debug parameter that can be set to see where PowerDNS is spending its time?
>
> I've already gone through the performance guide and don't see any additional
> tuning parameters that might help. We're using LUA, but 1) it's pretty
> lightweight (a couple hash lookups and modify dq object), and 2) when I
> disabled the LUA scripting for testing, it didn't make a noticeable
> difference in the load.
>
> I'm in the process of building a better test env to subject PowerDNS to more
> controlled testing, but wanted to get the question of what I should be
> expecting out there to see if anyone could provide some helpful feedback.
>
> Thanks,
> Mark
Impossible to say anything without any info about hardware, os, config
and metrics.
-Otto
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