number of forward-zones vs. performance

[Daisuke HIGASHI]

In Unbound, forward-zones (or stub-zones) are stored as leaf elements of
the unified red-black tree to maintain delegations for DNS tree.

Theoretically, setting up thousands of forward-zones can be considered the
same situation that Unbound caches _only_ thousands of delegation
information and performance is unlikely to degrade, but performance may
vary depending on usage, so you may want to do some performance testing.

A.Schulze via Unbound-users <unbound-users at lists.nlnetlabs.nl>:

> Hello,
>
> over the last years I run unbound with zero or a small number of
> configures forward-zones.
> Now, I was asked to configure 1-2 thousand forward-zones. Do I have to be
> concerned about performance degration?
>
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