BIND 9.3.2 on FreeBSD 6.1 out of control

Mark Andrews Mark_Andrews at
Tue Jan 2 22:59:38 UTC 2007

> I'm running BIND 9.3.2 on FreeBSD 6.1, and am noticing that it gets
> out of control after running for a while.
> D
> 60480     53             1 132    0   195M   194M RUN     41.7H 75.54% named
> After restarting it, its CPU usage goes back down to what it should
> be, as does its memory usage. I really don't want to babysit this
> process, so I'm trying to find the cause of this. I have
> "max-cache-size" set to "150M", as before I turned this on, this
> process would just grow and grow until it hit FreeBSD's limit and
> would stop responding all together not to mention eating up as much
> CPU time as it could.
> I never had this problem at all with BIND 8, and am wondering if
> there's something I'm doing wrong with BIND 9 to have this problem?

	BIND 8 has a smaller memory foot print.

> Has anyone else experienced this? On a related note, is there any way
> to have BIND 9 keep its memory usage much lower automatically without
> having to set an arbitrary/explicit max-cache-size? (ie. Have it clean
> up its own cache for entries that haven't been used after a certain
> period of time?)

	It does do that based on ttl.  max-cache-size is an additional
	constraint.  You can also adjust maximum retention times using
	max-cache-ttl and max-ncache-ttl.

	195M with a 150M max-cache-size sounds about right.  You have
	150M of active cache and some overhead.
> Any help would be greatly appreciated.
> Patrick
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at

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