[dnsdist] [EXT] Re: Performance/tuning sanity check

[Nicolas Baumgarten]

Hi Dan,
We obtained great numbers with only one instance after the changes that
Remi mentioned in 1.3.X

Almost 600Kqps as mentioned.
The setup involved disabling all FW rules, some sysctls and ethtool, but no
cpu affinity.

Don't have all the setup here now, But its also very specific to your setup.

Good luck!
nico

On Tue, Jan 3, 2023 at 1:19 PM Remi Gacogne via dnsdist <
dnsdist at mailman.powerdns.com> wrote:

> On 03/01/2023 17:07, Dan McCombs wrote:
> > I spent some time looking through the thread Nicolas shared at
> > https://mailman.powerdns.com/pipermail/dnsdist/2017-April/000281.html
> > <https://mailman.powerdns.com/pipermail/dnsdist/2017-April/000281.html>
> > of his performance tuning experience. Do you know if it's still the case
> > in newer versions of dnsdist to need multiple instances of dnsdist
> > running on a machine this size (32 cores) rather than just additional
> > listeners via addLocal to really push past 400kQPS? I just want to make
> > sure I'm not working off out-of-date information.
>
> A lot has changed with regard to scalability on machines with a great
> number of cores. I remember us doing a lot of work in that area in
> 1.3.0, and we also added a few more improvements since then (false
> sharing work-around, more sharding, more efficient locking, etc)
>
> I have personally reached quite more than 400k QPS with a single dnsdist
> process during my tests, but you might be able to get better performance
> with several processes as we are still sharing some state between
> threads. For example Otto has been working on more scalable counters in
> the recursor lately, and this is something that I would like to
> implement in dnsdist. It will likely have to wait until 1.9, so around
> Q3 this year, unless someone beats me to it :)
>
> Please report back with your findings, as it is really helpful to hear
> about different setups than the ones we already do our performance
> testing on.
>
> --
> Remi Gacogne
> PowerDNS.COM BV - https://www.powerdns.com/
>
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