[dnsdist] dnsdist capacity

[bert hubert]

> How many the same backend servers I can use (your reccomendation for a lot of qps)?
> 
> Could you explain more information about the 'sockets' parameter on the 'newServer()' . Is it mean 'reuseport'?
> Thank you for your support!

"sockets" increases the number of connections to the same backend:

  sockets=NUM            -- Number of sockets (and thus source ports) used toward the backend server, defaults to a single one

>From https://dnsdist.org/reference/config.html?highlight=sockets

Try 8 and see what happens.

	Bert