named out of swap on NetBSD/amd64

[Jan Schaumann]

Jan Schaumann via bind-users <bind-users at lists.isc.org> wrote:
> Greg Choules <gregchoules+bindusers at googlemail.com> wrote:

> > - Are you stuck on 9.16.30 for some reason? If not, grab the latest 9.18
> > package. It will be less memory hungry generally and contain fixes for
> > recent issues.
> 
> Yeah, will give that a try.

Upgrading to 9.18.11 by itself did not help, but
setting an explicit 'max-cache-size' does seem to.

The queries I'm doing right now are all unique
second-level domain queries, so no caching takes
place, while at the same time the cache grows
proportionally with the queries.

I'm guessing that without a set 'max-cache-size', this
continues to grow until there is no more memory space
left, we start swapping, and eventually get OOM
killed.

https://bind9.readthedocs.io/en/v9_18_11/reference.html
claims that the default 'max-cache-size' is 90% of
physical memory, but it seems that didn't work out
here.  Might it be that on NetBSD, bind doesn't
correctly determine the physical memory amount?

-Jan