Unbound on FreeBSD 11, uses just one of 8 threads?

[Viktor Dukhovni]

I have 8 threads configured, anyone know why unbound would
do all the work in just one thread?

Build info:

  # /usr/local/sbin/unbound -h
  [...]
  Version 1.7.1
  linked libs: libevent 2.1.8-stable (it uses kqueue), OpenSSL 1.0.2o  27 Mar 2018
  linked modules: dns64 respip validator iterator
  [...]

Configuration below my signature, stats below (the machine is
running the DANE adoption survey, so yes, ~3.5 billion queries with
a low cache hit rate is right):

# /usr/local/sbin/unbound-control stats_noreset | egrep -v '=0$'
thread0.recursion.time.avg=0.000000
thread1.recursion.time.avg=0.000000
thread2.recursion.time.avg=0.000000
thread3.recursion.time.avg=0.000000
thread4.recursion.time.avg=0.000000
thread5.recursion.time.avg=0.000000
thread6.recursion.time.avg=0.000000
thread7.num.queries=3478975092
thread7.num.cachehits=1422530
thread7.num.cachemiss=3477552562
thread7.num.recursivereplies=3477552317
thread7.requestlist.avg=257.029
thread7.requestlist.max=1266
thread7.requestlist.current.all=245
thread7.requestlist.current.user=245
thread7.recursion.time.avg=0.220082
thread7.recursion.time.median=0.0963222
total.num.queries=3478975092
total.num.cachehits=1422530
total.num.cachemiss=3477552562
total.num.recursivereplies=3477552317
total.requestlist.avg=257.029
total.requestlist.max=1266
total.requestlist.current.all=245
total.requestlist.current.user=245
total.recursion.time.avg=0.220082
total.recursion.time.median=0.0120403

-- 
	Viktor.

Configuration:

# find /usr/local/etc/unbound/ -name '*.conf' -print0 |
  xargs -0 cat |
  pcregrep -v '^\s*(#|$)'

server:
	username: unbound
	directory: /usr/local/etc/unbound
	chroot: /usr/local/etc/unbound
	pidfile: /usr/local/etc/unbound/unbound.pid
	auto-trust-anchor-file: /usr/local/etc/unbound/root.key
server:
	domain-insecure: "fserver.org"
stub-zone:
	name: "."
	stub-addr: <slave root zone server>
	stub-first: yes
stub-zone:
	name: "arpa"
	stub-addr: <slave arpa zone server>
	stub-first: yes
server:
	verbosity: 0
	module-config: "validator iterator"
	minimal-responses: yes
	qname-minimisation: no
	cache-max-ttl: 7200
	cache-max-negative-ttl: 1200
	val-sig-skew-min: 3600
	val-sig-skew-max: 3600
	harden-algo-downgrade: no
	num-threads: 8
	msg-cache-slabs: 8
	rrset-cache-slabs: 8
	infra-cache-slabs: 8
	key-cache-slabs: 8
	key-cache-size: 256m
	rrset-cache-size: 256m
	msg-cache-size: 128m
	neg-cache-size: 16m
	jostle-timeout: 500
	delay-close: 1500
	interface: 127.0.0.1
	interface: 192.168.1.1
	so-reuseport: yes
	access-control: 127.0.0.0/8 allow
	access-control: 192.168.1.0/24 allow
	edns-buffer-size: 8192
	max-udp-size: 8192
	do-not-query-localhost: yes
	do-not-query-address: 127.0.0.1/8
	do-not-query-address: ::1
	do-ip4: yes
	do-ip6: no
	do-udp: yes
	do-tcp: yes
	prefer-ip6: no
	outgoing-range: 16384
	num-queries-per-thread: 8192
	outgoing-port-permit: 1024-65535
	outgoing-port-avoid: 1-1023
	outgoing-num-tcp: 256
	incoming-num-tcp: 256
	so-rcvbuf: 12m
	so-sndbuf: 12m
	infra-cache-numhosts: 100000
server:
	unblock-lan-zones: yes
	insecure-lan-zones: yes
remote-control:
	control-enable: yes
	control-interface: /usr/local/etc/unbound/unbound.ctl
	control-use-cert: no