Unbound performance tuning to prevent flood fails

[Юрий Иванов]

Hi,
I've got vm based unbound and trying to tune unbound perfomance to able process huge loads.
For testing I'm using dnsflood utility. (https://github.com/nickwinn/dns-flood)

Server has 16 cores (unbound max-threads also 16) with 6GB of memory.
When I perfom flood, ./dnsflood A 10.0.0.10, server simply stops replying:

dig @10.0.0.10 google.com
;; Warning: ID mismatch: expected ID 28634, got 48552
;; Warning: ID mismatch: expected ID 28634, got 41394
;; Warning: ID mismatch: expected ID 28634, got 62162
;; Warning: ID mismatch: expected ID 28634, got 25233
...

Trying this https://nlnetlabs.nl/documentation/unbound/howto-optimise/ but that doesn't help.
Maybe there is some perfomance tuning of unbound to help process massive loads?
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