[dnsdist] First alpha release of dnsdist 1.6.0

[Stephane Bortzmeyer]

On Wed, Feb 03, 2021 at 09:56:02AM +0100,
 Remi Gacogne <remi.gacogne at powerdns.com> wrote 
 a message of 47 lines which said:

> Did you also enable out-of-order between dnsdist and the backend, using
> maxInFlight on the newServer() directive?

Yes:

newServer({address="127.0.0.1:53", name="Local-Unbound", useClientSubnet=false, maxInFlight=256})		-

The backend is an Unbound, used over UDP.

> Do you know if the backend does indeed support out-of-order?

Is it relevant when you talk to the backend over UDP? 

> However in your case I'm guessing the monitoring scripts do not really do
> pipelining,

Correct. One request, on one connection.

> Note that client-side DoH in dnsdist has always supported
> out-of-order, as the underlying design of HTTP/2 made that quite
> easy, so nothing should change for DoH in 1.6.0.

Indeed, DoH has no issue, it is purely a DoT problem.

I'm currently testing with maxInFlight=0 on everything (addTLSLocal
and newServer). Should I also test with maxInFlight=256 on addTLSLocal
but maxInFlight=0 on newServer?