[Unbound-users] Newbie seeks config advice
Steve Snyder
swsnyder at snydernet.net
Fri Aug 19 19:06:29 UTC 2011
Hello.
I am very new to unbound. I've used BIND for years, though, so I understand the DNS concepts. Mind if I ask a few questions?
Below is my unbound configuration and farther below are the stats from an 18-hour run of unbound. I am running RHEL 5.7 on a dual-core CPU with SMT enabled (i.e. the OS sees 4 processors) with plenty of RAM. Unbound was built against the current versions of it's dependencies, except for version 2.5 of GLibC.
1. I built unbound with the libevent library because I read that it improved scalability, which seemed reasonable given that I can run 4 threads simultaneously. After 18 hours with what I think is a representative load I get this:
info: server stats for thread 0: 622 queries, 98 answers from cache, 524 recursions, 10 prefetch
info: server stats for thread 1: 18161 queries, 3186 answers from cache, 14975 recursions, 265 prefetch
info: server stats for thread 2: 15963 queries, 2746 answers from cache, 13217 recursions, 248 prefetch
info: server stats for thread 3: 1064 queries, 179 answers from cache, 885 recursions, 20 prefetch
info: server stats for thread 0: requestlist max 6 avg 0.153558 exceeded 0 jostled 0
info: server stats for thread 1: requestlist max 11 avg 0.594094 exceeded 0 jostled 0
info: server stats for thread 2: requestlist max 11 avg 0.496547 exceeded 0 jostled 0
info: server stats for thread 3: requestlist max 3 avg 0.109392 exceeded 0 jostled 0
It looks to me like 2 of unbound's 4 threads are superfluous. Given this load (roughly 2000 queries per hour) I wonder if I would be better off giving up on the libevent config and just running 2 threads in a forked configuration. Opinions?
2. Of the roughly 26,000 recursions done, 11 of them took over 512 seconds (1 over 1024 seconds!). I realize that 11 out of 26,000 is a tiny percentage, but I'm concerned that unbound didn't give up on these recursions earlier. Does unbound impose a max recursion time, or do stuck recursions linger until the program is terminated?
Thank you.
----------------------
server:
verbosity: 1
logfile: /var/unbound/unbound.log
interface: 127.0.0.1
port: 53
do-ip4: yes
do-ip6: no
do-udp: yes
do-tcp: yes
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: no
access-control: 127.0.0.0/8 allow
root-hints: "/var/unbound/etc/root.hints"
hide-identity: yes
hide-version: yes
harden-glue: yes
harden-dnssec-stripped: yes
use-caps-for-id: yes
cache-min-ttl: 3600
cache-max-ttl: 86400
prefetch: yes
num-threads: 4
msg-cache-slabs: 8
rrset-cache-slabs: 8
infra-cache-slabs: 8
key-cache-slabs: 8
rrset-cache-size: 256m
msg-cache-size: 128m
so-rcvbuf: 8m
unwanted-reply-threshold: 10000
do-not-query-localhost: no
auto-trust-anchor-file: "/var/unbound/etc/root.key"
val-clean-additional: yes
remote-control:
control-enable: yes
control-interface: 127.0.0.1
control-interface: ::1
control-port: 8953
server-key-file: "/var/unbound/unbound_server.key"
server-cert-file: "/var/unbound/unbound_server.pem"
control-key-file: "/var/unbound/unbound_control.key"
control-cert-file: "/var/unbound/unbound_control.pem"
----------------------
[1313775217] unbound[13949:0] info: service stopped (unbound 1.4.12).
[1313775217] unbound[13949:0] info: server stats for thread 0: 622 queries, 98 answers from cache, 524 recursions, 10 prefetch
[1313775217] unbound[13949:0] info: server stats for thread 0: requestlist max 6 avg 0.153558 exceeded 0 jostled 0
[1313775217] unbound[13949:0] info: average recursion processing time 5.813445 sec
[1313775217] unbound[13949:0] info: histogram of recursion processing times
[1313775217] unbound[13949:0] info: [25%]=0.0138354 median[50%]=0.0429744 [75%]=0.0246724
[1313775217] unbound[13949:0] info: lower(secs) upper(secs) recursions
[1313775217] unbound[13949:0] info: 0.000000 0.000001 15
[1313775217] unbound[13949:0] info: 0.008192 0.016384 1
[1313775217] unbound[13949:0] info: 0.016384 0.032768 31
[1313775217] unbound[13949:0] info: 0.032768 0.065536 65
[1313775217] unbound[13949:0] info: 0.065536 0.131072 90
[1313775217] unbound[13949:0] info: 0.131072 0.262144 183
[1313775217] unbound[13949:0] info: 0.262144 0.524288 85
[1313775217] unbound[13949:0] info: 0.524288 1.000000 26
[1313775217] unbound[13949:0] info: 1.000000 2.000000 9
[1313775217] unbound[13949:0] info: 2.000000 4.000000 2
[1313775217] unbound[13949:0] info: 4.000000 8.000000 3
[1313775217] unbound[13949:0] info: 8.000000 16.000000 1
[1313775217] unbound[13949:0] info: 16.000000 32.000000 2
[1313775217] unbound[13949:0] info: 64.000000 128.000000 1
[1313775217] unbound[13949:0] info: 128.000000 256.000000 5
[1313775217] unbound[13949:0] info: 256.000000 512.000000 5
[1313775217] unbound[13949:0] info: server stats for thread 1: 18161 queries, 3186 answers from cache, 14975 recursions, 265 prefetch
[1313775217] unbound[13949:0] info: server stats for thread 1: requestlist max 11 avg 0.594094 exceeded 0 jostled 0
[1313775217] unbound[13949:0] info: average recursion processing time 1.006430 sec
[1313775217] unbound[13949:0] info: histogram of recursion processing times
[1313775217] unbound[13949:0] info: [25%]=0.0065687 median[50%]=0.0344844 [75%]=0.0331288
[1313775217] unbound[13949:0] info: lower(secs) upper(secs) recursions
[1313775217] unbound[13949:0] info: 0.000000 0.000001 512
[1313775217] unbound[13949:0] info: 0.008192 0.016384 52
[1313775217] unbound[13949:0] info: 0.016384 0.032768 1032
[1313775217] unbound[13949:0] info: 0.032768 0.065536 1865
[1313775217] unbound[13949:0] info: 0.065536 0.131072 2821
[1313775217] unbound[13949:0] info: 0.131072 0.262144 4582
[1313775217] unbound[13949:0] info: 0.262144 0.524288 2906
[1313775217] unbound[13949:0] info: 0.524288 1.000000 799
[1313775217] unbound[13949:0] info: 1.000000 2.000000 133
[1313775217] unbound[13949:0] info: 2.000000 4.000000 53
[1313775217] unbound[13949:0] info: 4.000000 8.000000 43
[1313775217] unbound[13949:0] info: 8.000000 16.000000 37
[1313775217] unbound[13949:0] info: 16.000000 32.000000 43
[1313775217] unbound[13949:0] info: 32.000000 64.000000 3
[1313775217] unbound[13949:0] info: 64.000000 128.000000 11
[1313775217] unbound[13949:0] info: 128.000000 256.000000 52
[1313775217] unbound[13949:0] info: 256.000000 512.000000 24
[1313775217] unbound[13949:0] info: 512.000000 1024.000000 7
[1313775218] unbound[13949:0] info: server stats for thread 2: 15963 queries, 2746 answers from cache, 13217 recursions, 248 prefetch
[1313775218] unbound[13949:0] info: server stats for thread 2: requestlist max 11 avg 0.496547 exceeded 0 jostled 0
[1313775218] unbound[13949:0] info: average recursion processing time 2.012690 sec
[1313775218] unbound[13949:0] info: histogram of recursion processing times
[1313775218] unbound[13949:0] info: [25%]=0.00832985 median[50%]=0.0363712 [75%]=0.0380048
[1313775218] unbound[13949:0] info: lower(secs) upper(secs) recursions
[1313775218] unbound[13949:0] info: 0.000000 0.000001 431
[1313775218] unbound[13949:0] info: 0.000512 0.001024 1
[1313775218] unbound[13949:0] info: 0.004096 0.008192 1
[1313775218] unbound[13949:0] info: 0.008192 0.016384 25
[1313775218] unbound[13949:0] info: 0.016384 0.032768 961
[1313775218] unbound[13949:0] info: 0.032768 0.065536 1568
[1313775218] unbound[13949:0] info: 0.065536 0.131072 2496
[1313775218] unbound[13949:0] info: 0.131072 0.262144 4056
[1313775218] unbound[13949:0] info: 0.262144 0.524288 2578
[1313775218] unbound[13949:0] info: 0.524288 1.000000 706
[1313775218] unbound[13949:0] info: 1.000000 2.000000 143
[1313775218] unbound[13949:0] info: 2.000000 4.000000 43
[1313775218] unbound[13949:0] info: 4.000000 8.000000 33
[1313775218] unbound[13949:0] info: 8.000000 16.000000 36
[1313775218] unbound[13949:0] info: 16.000000 32.000000 41
[1313775218] unbound[13949:0] info: 32.000000 64.000000 3
[1313775218] unbound[13949:0] info: 64.000000 128.000000 9
[1313775218] unbound[13949:0] info: 128.000000 256.000000 51
[1313775218] unbound[13949:0] info: 256.000000 512.000000 34
[1313775218] unbound[13949:0] info: 512.000000 1024.000000 1
[1313775218] unbound[13949:0] info: server stats for thread 3: 1064 queries, 179 answers from cache, 885 recursions, 20 prefetch
[1313775218] unbound[13949:0] info: server stats for thread 3: requestlist max 3 avg 0.109392 exceeded 0 jostled 0
[1313775218] unbound[13949:0] info: average recursion processing time 5.461816 sec
[1313775218] unbound[13949:0] info: histogram of recursion processing times
[1313775218] unbound[13949:0] info: [25%]=0.00880758 median[50%]=0.0356336 [75%]=0.0435686
[1313775218] unbound[13949:0] info: lower(secs) upper(secs) recursions
[1313775218] unbound[13949:0] info: 0.000000 0.000001 31
[1313775218] unbound[13949:0] info: 0.008192 0.016384 2
[1313775218] unbound[13949:0] info: 0.016384 0.032768 66
[1313775218] unbound[13949:0] info: 0.032768 0.065536 99
[1313775218] unbound[13949:0] info: 0.065536 0.131072 173
[1313775218] unbound[13949:0] info: 0.131072 0.262144 263
[1313775218] unbound[13949:0] info: 0.262144 0.524288 179
[1313775218] unbound[13949:0] info: 0.524288 1.000000 39
[1313775218] unbound[13949:0] info: 1.000000 2.000000 12
[1313775218] unbound[13949:0] info: 2.000000 4.000000 3
[1313775218] unbound[13949:0] info: 4.000000 8.000000 1
[1313775218] unbound[13949:0] info: 8.000000 16.000000 1
[1313775218] unbound[13949:0] info: 16.000000 32.000000 2
[1313775218] unbound[13949:0] info: 32.000000 64.000000 1
[1313775218] unbound[13949:0] info: 64.000000 128.000000 1
[1313775218] unbound[13949:0] info: 128.000000 256.000000 5
[1313775218] unbound[13949:0] info: 256.000000 512.000000 4
[1313775218] unbound[13949:0] info: 512.000000 1024.000000 2
[1313775218] unbound[13949:0] info: 1024.000000 2048.000000 1
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