[Pdns-users] Lower limit to network-timeout recursor config parameter ?

[Florent Krieg]

Thanks for the information Bert!
That sounds legit. Following your advice I will run some more benchmarks :)

Florent

2016-09-12 14:18 GMT+02:00 bert hubert <bert.hubert at powerdns.com>:

> Florent,
>
> The story is, PowerDNS Recursor makes a sweep every so many packets to find
> out if there are timeout conditions.
>
> So on a loaded recursor, you might get very accurate timeouts even below
> 500ms.
>
> Can you redo your tests with traffic load?
>
>         Bert
>
> On Thu, Sep 08, 2016 at 03:03:58PM +0200, Florent Krieg wrote:
> > Hmmm sorry to spam, doesn't seem relevant, we're using a more recent
> > version...
> > Investigation still going on...
> >
> > 2016-09-08 15:00 GMT+02:00 Florent Krieg <flokrrr at gmail.com>:
> >
> > > Ok, that may be
> > >
> > > *Make timeouts for queries to remote authoritative servers configurable
> > > with millisecond granularity. In addition, the old code turned out to
> > > consider the timeout expired when the integral number of seconds since
> 1970
> > > increased by 1 - which on average is after 500ms. This might have
> caused
> > > spurious timeouts! New default timeout is 1500ms. See network-timeout
> > > setting for more details. Code in commit 1402.*
> > >
> > > :)
> > > Florent
> > >
> > > 2016-09-07 18:18 GMT+02:00 Florent Krieg <flokrrr at gmail.com>:
> > >
> > >> Hello everybody,
> > >>
> > >> Just wanted to know if there was any lower limit to the
> network-timeout
> > >> config param on the recursor?
> > >>
> > >> I have a situation where I want to setup in advance a zone forward to
> > >> nameservers not already created in my network, and to avoid long
> queries I
> > >> wanted to setup for instance network-timeout to like 20ms on our
> recursors.
> > >>
> > >> I have found however that setting this param to less than 500ms is
> > >> useless, as it seems to reach its lower value at 500ms. Is that
> expected ?
> > >>
> > >> Thanks in advance.
> > >> Best regards
> > >> Florent
> > >>
> > >
> > >
>
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>
>
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