[dnsdist] dnsdist performance

[Nico]

Big Difference! thanks for the advice.
We already have 130 rules. Joined them un two suffixmatch and the load
dropped considerably.
Thanks again.

[image: image.png]


On Tue, Jun 26, 2018 at 9:44 AM Remi Gacogne <remi.gacogne at powerdns.com>
wrote:

> Hi Nico,
>
> On 06/19/2018 10:42 PM, Nico wrote:
> > We upgraded to 1.3, everything fine.
> > Redid our test with the following results:
> > # procs       # listeners     kq/s
> > <
> http://tornado.pert.com.ar/twiki/bin/view/FAQ/PersonalDnsDistPruebasCarga?sortcol=2;table=1;up=0#sorted_table
> >
> > % no error
> > <
> http://tornado.pert.com.ar/twiki/bin/view/FAQ/PersonalDnsDistPruebasCarga?sortcol=3;table=1;up=0#sorted_table
> >
> > 1     6       340     94%
> > 1     9       380     98%
> > 1     15      400     100%
> > 1     15      500     99%
> > 1     25      600     98%
> > 3     6       500     99%
> >
> >
> > Above 550 Kqps we were over 85% of interface usage and were many network
> > errors.
>
> Thanks a lot for these numbers! It does look a lot better than last time.
>
> > One important thing we noticed is that in our production configuration
> > we have ~60 drop rules :
> > addAction('example.com <http://example.com>', DropAction())
> >
> > Whit these rules the performance dropped almost 30%
> > We are moving those rules to the backend resolvers now, because it
> > doesn't make sense
> > to have this drop on performance when almost all our queries are cached
> > (98% hit rate)
>
> Did you consider grouping all those 60 rules into a single one using
> SuffixMatchNodeRule()? The cost should be much lighter.
>
>
> Best regards,
> --
> Remi Gacogne
> PowerDNS.COM BV - https://www.powerdns.com/
>
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