[dnsdist] dnsdist performance

[Remi Gacogne]

Hi Gentian,

On 8/12/19 10:20 AM, Gentian Bajraktari wrote:
> Just did, its showing on metronome: Gentian-DNSDIST-TEST

Thank you, I see it! Unfortunately it looks like your test was quite
short and metronome reduces the precision after a few hours so I'm not
sure I see the whole picture, but it looks like the results are terrible.
I see that the packet cache is enabled but you reach a very low number
of QPS for a very high system CPU usage. It does not really make sense
to me, could you make sure that the CPUs assigned to your VMs are
dedicated to it, or at the very least are not over committed? It
certainly looks that way.

Best regards,

Remi

> On Mon, 12 Aug 2019 at 10:16, Remi Gacogne <remi.gacogne at powerdns.com
> <mailto:remi.gacogne at powerdns.com>> wrote:
> 
>     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 <http://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>
>     <mailto: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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> 


-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/

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