[dnsdist] dnsdist performance

[Remi Gacogne]

Hi Gentian,

On 8/12/19 10:12 AM, Gentian Bajraktari wrote:
> I have attached results from resperf ( latest compiled, 2.3.1) and the
> configuration file (dnsdist.conf)

Would you consider sending metrics to our public metronome server [1]
so we understand what's the limiting factor during your tests? You only
need to add a line like this one to your dnsdist configuration:

carbonServer("37.252.122.50:2003",
"put-the-name-you-want-to-display-here", 5)

This will only send some metrics without any private information and is
very useful to understand where the bottleneck may be.

[1]: https://metronome1.powerdns.com/

Best regards,

Remi

> On Sat, 10 Aug 2019 at 22:30, Klaus Darilion
> <klaus.mailinglists at pernau.at <mailto:klaus.mailinglists at pernau.at>> wrote:
> 
>     Am 08.08.2019 um 10:20 schrieb Gentian Bajraktari:
>     > Dear Dnsdist community,
>     >
>     > we are trying to setup dnsdist as a loadbalancer for 2 bind recursive
>     > cache only servers,
>     >
>     > we have done a very simple setup:
>     > addLocal("DNSDIST_IP")
>     > newServer({address="BIND_IP1"})
>     > newServer({address=" BIND_IP2"})
>     > setServerPolicy(roundrobin)
>     >
>     > but when we test with resperf (from dnsperf tool), the results are
>     very
>     > bad for DNSDIST, around 5-15K QPS , while when we test directly to
>     one
>     > of BIND ip addresses the QPS goes up to 50-60Qps.
>     >
>     > we have tried both rpm install of dnsdist, compiling from source and
>     > even comiling the concur version but all with similar results, ie
>     when
>     > resperf tests go through dnsdist the results are much lower in
>     terms of qps.
>     >
>     > OS is Centos7 in all servers, tweaked all settings for file
>     limits, udp
>     > connections etc.
>     >
>     > any thoughts on what we can do? maybe resperf is not the tool to test
>     > this? do you have some suggetions on how we can test and make sure we
>     > are doing the right thing?
> 
>     I had similar results. Starting 4 listening threads and 4 receivers
>     threads (by adding the same backend 4 times) boosted my performance -
>     almost linear.
> 
>     If it still does not work your should post your config (and first test
>     without any rules to avoid performance issues because of rules)
> 
>     regards
>     Klaus
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> 
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-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/

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