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Hello,<br>
<br>
Better late, than never. :)<br>
No, I still have my problems, and I have reached the point where I
would like to do something against it.<br>
<br>
The setup is similar as Felix's (even in terms of the qps values), but
the problem seems to be different.<br>
<br>
The environment is: FreeBSD 7/amd64 STABLE, quad core CPUs, but only
one used by unbound (it runs unthreaded). It's compiled with libev,
statically.<br>
Configuration:<br>
server:<br>
verbosity: 0<br>
statistics-interval: 0<br>
extended-statistics: yes<br>
#num-threads: 2<br>
outgoing-range: 8192<br>
msg-cache-size: 1700M<br>
num-queries-per-thread: 8192<br>
rrset-cache-size: 4000M<br>
do-daemonize: no<br>
access-control: 0.0.0.0/0 allow<br>
access-control: ::/0 allow<br>
chroot: ""<br>
username: ""<br>
directory: "/etc"<br>
<br>
As I can't turn on query logging (it effectively kills the server),
I've traced it with ktrace and checked the missing responses there.<br>
What I can see is the investigated packets (queries) for which there
was no response, doesn't appear in the trace (but tcpdump sees it), so
it seems that unbound doesn't even get them.<br>
<br>
top says:<br>
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU
COMMAND<br>
1522 bind 1 4 -15 7305M 7168M kqread 1 864:59 33.54%
unbound<br>
<br>
So unbound doesn't max out the CPU (core) it runs on.<br>
<br>
I have started a sequential lookup of several hostnames, in the form of
$i.zone, where $i is an integer ranging 0 to 20000, the query fires
every milliseconds. All of the records are in the cache.<br>
The test shows success ratios of:<br>
2009-09-14 17:18:52+0200 [-] XXX sequential: 98.219090 out of
47953.000000<br>
2009-09-14 17:28:52+0200 [-] XXX sequential: 97.950930 out of
48217.000000<br>
2009-09-14 17:38:52+0200 [-] XXX sequential: 98.321538 out of
47901.000000<br>
2009-09-14 17:48:52+0200 [-] XXX sequential: 98.096286 out of
48169.000000<br>
2009-09-14 17:58:52+0200 [-] XXX sequential: 98.095040 out of
48190.000000<br>
2009-09-14 18:08:52+0200 [-] XXX sequential: 98.133461 out of
48164.000000<br>
2009-09-14 18:18:52+0200 [-] XXX sequential: 98.222950 out of
48226.000000<br>
2009-09-14 18:28:52+0200 [-] XXX sequential: 98.217362 out of
48187.000000<br>
2009-09-14 18:38:52+0200 [-] XXX sequential: 97.964281 out of
48042.000000<br>
2009-09-14 18:48:52+0200 [-] XXX sequential: 97.921717 out of
48261.000000<br>
2009-09-14 18:58:52+0200 [-] XXX sequential: 97.506948 out of
48214.000000<br>
2009-09-14 19:08:52+0200 [-] XXX sequential: 97.060414 out of
48068.000000<br>
2009-09-14 19:18:52+0200 [-] XXX sequential: 97.214335 out of
48247.000000<br>
2009-09-14 19:28:52+0200 [-] XXX sequential: 96.783492 out of
48220.000000<br>
2009-09-14 19:38:52+0200 [-] XXX sequential: 96.252864 out of
48010.000000<br>
2009-09-14 19:48:52+0200 [-] XXX sequential: 96.240118 out of
48193.000000<br>
2009-09-14 19:58:52+0200 [-] XXX sequential: 95.753322 out of
48014.000000<br>
2009-09-14 20:08:52+0200 [-] XXX sequential: 95.321613 out of
47837.000000<br>
2009-09-14 20:18:52+0200 [-] XXX sequential: 94.027737 out of
48022.000000<br>
2009-09-14 20:28:52+0200 [-] XXX sequential: 93.054829 out of
47803.000000<br>
2009-09-14 20:38:52+0200 [-] XXX sequential: 93.724317 out of
47453.000000<br>
2009-09-14 20:48:52+0200 [-] XXX sequential: 94.639940 out of
47742.000000<br>
2009-09-14 20:58:52+0200 [-] XXX sequential: 95.425759 out of
48161.000000<br>
2009-09-14 21:08:52+0200 [-] XXX sequential: 94.936893 out of
48172.000000<br>
2009-09-14 21:18:52+0200 [-] XXX sequential: 96.082117 out of
47883.000000<br>
2009-09-14 21:28:52+0200 [-] XXX sequential: 97.559304 out of
48142.000000<br>
2009-09-14 21:38:52+0200 [-] XXX sequential: 97.683090 out of
47736.000000<br>
2009-09-14 21:48:52+0200 [-] XXX sequential: 98.036436 out of
47974.000000<br>
2009-09-14 21:58:52+0200 [-] XXX sequential: 97.378246 out of
47945.000000<br>
2009-09-14 22:08:52+0200 [-] XXX sequential: 98.166017 out of
47983.000000<br>
2009-09-14 22:18:52+0200 [-] XXX sequential: 98.314385 out of
48113.000000<br>
2009-09-14 22:28:52+0200 [-] XXX sequential: 98.599084 out of
48040.000000<br>
2009-09-14 22:38:52+0200 [-] XXX sequential: 98.412136 out of
47989.000000<br>
2009-09-14 22:48:52+0200 [-] XXX sequential: 98.695048 out of
48201.000000<br>
2009-09-14 22:58:52+0200 [-] XXX sequential: 98.513611 out of
48305.000000<br>
2009-09-14 23:08:52+0200 [-] XXX sequential: 98.920180 out of
48434.000000<br>
2009-09-14 23:18:52+0200 [-] XXX sequential: 99.060181 out of
48520.000000<br>
2009-09-14 23:28:52+0200 [-] XXX sequential: 98.936499 out of
48519.000000<br>
2009-09-14 23:38:52+0200 [-] XXX sequential: 98.935555 out of
48382.000000<br>
2009-09-14 23:48:52+0200 [-] XXX sequential: 99.001955 out of
48595.000000<br>
2009-09-14 23:58:52+0200 [-] XXX sequential: 99.253300 out of
48480.000000<br>
2009-09-15 00:08:52+0200 [-] XXX sequential: 99.149614 out of
48331.000000<br>
2009-09-15 00:18:52+0200 [-] XXX sequential: 99.285111 out of
48539.000000<br>
2009-09-15 00:28:52+0200 [-] XXX sequential: 99.225860 out of
48570.000000<br>
2009-09-15 00:38:52+0200 [-] XXX sequential: 99.267158 out of
48578.000000<br>
2009-09-15 00:48:52+0200 [-] XXX sequential: 99.262403 out of
48536.000000<br>
2009-09-15 00:58:52+0200 [-] XXX sequential: 99.395223 out of
48613.000000<br>
2009-09-15 01:08:52+0200 [-] XXX sequential: 99.512507 out of
48411.000000<br>
2009-09-15 01:18:52+0200 [-] XXX sequential: 99.639863 out of
48315.000000<br>
2009-09-15 01:28:52+0200 [-] XXX sequential: 99.446795 out of
48445.000000<br>
2009-09-15 01:38:52+0200 [-] XXX sequential: 99.641119 out of
48484.000000<br>
2009-09-15 01:48:52+0200 [-] XXX sequential: 99.656541 out of
48623.000000<br>
2009-09-15 01:58:52+0200 [-] XXX sequential: 99.645806 out of
48561.000000<br>
2009-09-15 02:08:52+0200 [-] XXX sequential: 99.614957 out of
48566.000000<br>
2009-09-15 02:18:52+0200 [-] XXX sequential: 99.499526 out of
48554.000000<br>
2009-09-15 02:28:52+0200 [-] XXX sequential: 99.494784 out of
48692.000000<br>
2009-09-15 02:38:52+0200 [-] XXX sequential: 99.554204 out of
48677.000000<br>
2009-09-15 02:48:52+0200 [-] XXX sequential: 99.603517 out of
48678.000000<br>
2009-09-15 02:58:52+0200 [-] XXX sequential: 99.746867 out of
48591.000000<br>
2009-09-15 03:08:52+0200 [-] XXX sequential: 99.570842 out of
48467.000000<br>
2009-09-15 03:18:52+0200 [-] XXX sequential: 99.661702 out of
48478.000000<br>
2009-09-15 03:28:52+0200 [-] XXX sequential: 99.728875 out of
48686.000000<br>
2009-09-15 03:38:52+0200 [-] XXX sequential: 99.691504 out of
48623.000000<br>
2009-09-15 03:48:52+0200 [-] XXX sequential: 99.714585 out of
48701.000000<br>
2009-09-15 03:58:52+0200 [-] XXX sequential: 99.591510 out of
48716.000000<br>
2009-09-15 04:08:52+0200 [-] XXX sequential: 99.583351 out of
48002.000000<br>
2009-09-15 04:18:52+0200 [-] XXX sequential: 99.878633 out of
48613.000000<br>
2009-09-15 04:28:52+0200 [-] XXX sequential: 99.640406 out of
48666.000000<br>
2009-09-15 04:38:52+0200 [-] XXX sequential: 99.585105 out of
48687.000000<br>
2009-09-15 04:48:52+0200 [-] XXX sequential: 99.768124 out of
48733.000000<br>
2009-09-15 04:58:52+0200 [-] XXX sequential: 99.609704 out of
48681.000000<br>
2009-09-15 05:08:52+0200 [-] XXX sequential: 99.454856 out of
48611.000000<br>
2009-09-15 05:18:52+0200 [-] XXX sequential: 99.595258 out of
48673.000000<br>
2009-09-15 05:28:52+0200 [-] XXX sequential: 99.790477 out of
48682.000000<br>
2009-09-15 05:38:52+0200 [-] XXX sequential: 99.607077 out of
48610.000000<br>
2009-09-15 05:48:52+0200 [-] XXX sequential: 99.728512 out of
48621.000000<br>
2009-09-15 05:58:52+0200 [-] XXX sequential: 99.584687 out of
48638.000000<br>
2009-09-15 06:08:52+0200 [-] XXX sequential: 99.467724 out of
48659.000000<br>
2009-09-15 06:18:52+0200 [-] XXX sequential: 99.644516 out of
48666.000000<br>
2009-09-15 06:28:52+0200 [-] XXX sequential: 99.434750 out of
48651.000000<br>
2009-09-15 06:38:52+0200 [-] XXX sequential: 99.528710 out of
48590.000000<br>
2009-09-15 06:48:52+0200 [-] XXX sequential: 99.324658 out of
48568.000000<br>
2009-09-15 06:58:52+0200 [-] XXX sequential: 99.274856 out of
48680.000000<br>
2009-09-15 07:08:52+0200 [-] XXX sequential: 99.056467 out of
48435.000000<br>
2009-09-15 07:18:52+0200 [-] XXX sequential: 98.914725 out of
48467.000000<br>
2009-09-15 07:28:52+0200 [-] XXX sequential: 99.149702 out of
48336.000000<br>
2009-09-15 07:38:52+0200 [-] XXX sequential: 99.084450 out of
48277.000000<br>
2009-09-15 07:48:52+0200 [-] XXX sequential: 99.111203 out of
48380.000000<br>
2009-09-15 07:58:52+0200 [-] XXX sequential: 99.013334 out of
48446.000000<br>
2009-09-15 08:08:52+0200 [-] XXX sequential: 99.009881 out of
48378.000000<br>
2009-09-15 08:18:52+0200 [-] XXX sequential: 98.528652 out of
48391.000000<br>
2009-09-15 08:28:52+0200 [-] XXX sequential: 98.908414 out of
48370.000000<br>
2009-09-15 08:38:52+0200 [-] XXX sequential: 98.827193 out of
48175.000000<br>
2009-09-15 08:48:52+0200 [-] XXX sequential: 98.987568 out of
48102.000000<br>
2009-09-15 08:58:52+0200 [-] XXX sequential: 98.569997 out of
47902.000000<br>
2009-09-15 09:08:52+0200 [-] XXX sequential: 98.492483 out of
48026.000000<br>
2009-09-15 09:18:52+0200 [-] XXX sequential: 98.269443 out of
48077.000000<br>
2009-09-15 09:28:52+0200 [-] XXX sequential: 98.546045 out of
48007.000000<br>
2009-09-15 09:38:52+0200 [-] XXX sequential: 98.399799 out of
47869.000000<br>
2009-09-15 09:48:52+0200 [-] XXX sequential: 98.709502 out of
47811.000000<br>
2009-09-15 09:58:52+0200 [-] XXX sequential: 98.537404 out of
47655.000000<br>
2009-09-15 10:08:52+0200 [-] XXX sequential: 98.451378 out of
47849.000000<br>
2009-09-15 10:18:52+0200 [-] XXX sequential: 98.264597 out of
47597.000000<br>
2009-09-15 10:28:52+0200 [-] XXX sequential: 98.417808 out of
47529.000000<br>
2009-09-15 10:38:52+0200 [-] XXX sequential: 98.366144 out of
47495.000000<br>
2009-09-15 10:48:52+0200 [-] XXX sequential: 98.117186 out of
47429.000000<br>
2009-09-15 10:58:52+0200 [-] XXX sequential: 98.697592 out of
47297.000000<br>
2009-09-15 11:08:52+0200 [-] XXX sequential: 98.296661 out of
47084.000000<br>
2009-09-15 11:18:52+0200 [-] XXX sequential: 98.474591 out of
47266.000000<br>
2009-09-15 11:28:52+0200 [-] XXX sequential: 98.322687 out of
47278.000000<br>
2009-09-15 11:38:52+0200 [-] XXX sequential: 98.527923 out of
47416.000000<br>
2009-09-15 11:48:52+0200 [-] XXX sequential: 98.084607 out of
47301.000000<br>
<br>
(the first number is the success ratio in percent, the second number is
the number of sent queries in that time interval (so this is a ten
minutes average))<br>
As you can see, during off-hours the success rate is better, but still
not 100%.<br>
<br>
First I thought of an OS issue, but currently I don't think the problem
is there.<br>
Investigating the issue further, I realized that the timeouts come in
batches. They group together.<br>
It seems that the query success rate is OK most of the cases, then
about 1.2 seconds of massive timeouts come and then everything goes
back to normal (well, more normal than during those 1.2 seconds, but
not perfect, ie 100% response ratio)...<br>
<br>
I have tried to increase the UDP buffer size of the OS, but because of
the large number of outgoing ports configured, they took too much
space, so I've modified unbound, so it sets its SO_RCVBUF only on its
listen port (BTW, I think such a configuration option would be nice).<br>
The default (net.inet.udp.recvspace) is 42080, I've gradually increased
that to 256MB (I would say, it's insanely large) in the hope that it
helps unbound get the packets, which arrive during it does *something*.<br>
I could get some improvement with this, there are even some periods,
where the success rate was 100%, but it' still not perfect:<br>
2009-09-15 14:38:52+0200 [-] XXX sequential: 99.051233 out of
47430.000000<br>
2009-09-15 14:48:52+0200 [-] XXX sequential: 99.710347 out of
47298.000000<br>
2009-09-15 14:58:52+0200 [-] XXX sequential: 99.888882 out of
47697.000000<br>
2009-09-15 15:08:52+0200 [-] XXX sequential: 99.762475 out of
47995.000000<br>
2009-09-15 15:18:52+0200 [-] XXX sequential: 99.808570 out of
47537.000000<br>
2009-09-15 15:28:52+0200 [-] XXX sequential: 99.862677 out of
48062.000000<br>
2009-09-15 15:38:52+0200 [-] XXX sequential: 99.698107 out of
47699.000000<br>
2009-09-15 15:48:52+0200 [-] XXX sequential: 99.848422 out of
48160.000000<br>
2009-09-15 15:58:52+0200 [-] XXX sequential: 99.875514 out of
48198.000000<br>
2009-09-15 16:08:52+0200 [-] XXX sequential: 99.699083 out of
48186.000000<br>
2009-09-15 16:18:52+0200 [-] XXX sequential: 99.864521 out of
47978.000000<br>
2009-09-15 16:28:52+0200 [-] XXX sequential: 99.712572 out of
48012.000000<br>
2009-09-15 16:38:52+0200 [-] XXX sequential: 99.874543 out of
47825.000000<br>
2009-09-15 16:48:52+0200 [-] XXX sequential: 99.868906 out of
48057.000000<br>
2009-09-15 16:58:52+0200 [-] XXX sequential: 99.904021 out of
47927.000000<br>
2009-09-15 17:08:52+0200 [-] XXX sequential: 99.910614 out of
48106.000000<br>
2009-09-15 17:18:52+0200 [-] XXX sequential: 99.908695 out of
48190.000000<br>
2009-09-15 17:28:52+0200 [-] XXX sequential: 99.902315 out of
48114.000000<br>
2009-09-15 17:38:52+0200 [-] XXX sequential: 99.916715 out of
48028.000000<br>
2009-09-15 17:48:52+0200 [-] XXX sequential: 99.912966 out of
48257.000000<br>
2009-09-15 17:58:52+0200 [-] XXX sequential: 99.892526 out of
48384.000000<br>
2009-09-15 18:08:52+0200 [-] XXX sequential: 99.882346 out of
48447.000000<br>
2009-09-15 18:18:52+0200 [-] XXX sequential: 99.909243 out of
48481.000000<br>
2009-09-15 18:28:52+0200 [-] XXX sequential: 99.882491 out of
48507.000000<br>
2009-09-15 18:38:52+0200 [-] XXX sequential: 99.869665 out of
48337.000000<br>
2009-09-15 18:48:52+0200 [-] XXX sequential: 99.886764 out of
48571.000000<br>
2009-09-15 18:58:52+0200 [-] XXX sequential: 99.882566 out of
48538.000000<br>
2009-09-15 19:08:52+0200 [-] XXX sequential: 99.466975 out of
48403.000000<br>
2009-09-15 19:18:52+0200 [-] XXX sequential: 99.826961 out of
48544.000000<br>
2009-09-15 19:28:52+0200 [-] XXX sequential: 99.814739 out of
48580.000000<br>
2009-09-15 19:38:52+0200 [-] XXX sequential: 99.807819 out of
48392.000000<br>
2009-09-15 19:48:52+0200 [-] XXX sequential: 99.816842 out of
48592.000000<br>
2009-09-15 19:58:52+0200 [-] XXX sequential: 99.439580 out of
48535.000000<br>
2009-09-15 20:08:52+0200 [-] XXX sequential: 99.779327 out of
48488.000000<br>
2009-09-15 20:18:52+0200 [-] XXX sequential: 99.776809 out of
48389.000000<br>
2009-09-15 20:28:52+0200 [-] XXX sequential: 99.789782 out of
48521.000000<br>
2009-09-15 20:38:52+0200 [-] XXX sequential: 99.746872 out of
48197.000000<br>
2009-09-15 20:48:52+0200 [-] XXX sequential: 99.767087 out of
48516.000000<br>
2009-09-15 20:58:52+0200 [-] XXX sequential: 99.802270 out of
48551.000000<br>
2009-09-15 21:08:52+0200 [-] XXX sequential: 99.806146 out of
48490.000000<br>
2009-09-15 21:18:52+0200 [-] XXX sequential: 99.849512 out of
48509.000000<br>
2009-09-15 21:28:52+0200 [-] XXX sequential: 99.880587 out of
48571.000000<br>
2009-09-15 21:38:52+0200 [-] XXX sequential: 99.826069 out of
48295.000000<br>
2009-09-15 21:48:52+0200 [-] XXX sequential: 99.888726 out of
48529.000000<br>
2009-09-15 21:58:52+0200 [-] XXX sequential: 99.936082 out of
48500.000000<br>
2009-09-15 22:08:52+0200 [-] XXX sequential: 99.948361 out of
48413.000000<br>
2009-09-15 22:18:52+0200 [-] XXX sequential: 99.962945 out of
48576.000000<br>
2009-09-15 22:28:52+0200 [-] XXX sequential: 99.979399 out of
48541.000000<br>
2009-09-15 22:38:52+0200 [-] XXX sequential: 99.985530 out of
48377.000000<br>
2009-09-15 22:48:52+0200 [-] XXX sequential: 99.991753 out of
48505.000000<br>
2009-09-15 22:58:52+0200 [-] XXX sequential: 99.989729 out of
48680.000000<br>
2009-09-15 23:08:52+0200 [-] XXX sequential: 99.989719 out of
48634.000000<br>
2009-09-15 23:18:52+0200 [-] XXX sequential: 99.991774 out of
48628.000000<br>
2009-09-15 23:28:52+0200 [-] XXX sequential: 99.981514 out of
48685.000000<br>
2009-09-15 23:38:52+0200 [-] XXX sequential: 99.993813 out of
48492.000000<br>
2009-09-15 23:48:52+0200 [-] XXX sequential: 99.989739 out of
48726.000000<br>
2009-09-15 23:58:52+0200 [-] XXX sequential: 99.995883 out of
48579.000000<br>
2009-09-16 00:08:52+0200 [-] XXX sequential: 99.983505 out of
48500.000000<br>
2009-09-16 00:18:52+0200 [-] XXX sequential: 99.993835 out of
48662.000000<br>
2009-09-16 00:28:52+0200 [-] XXX sequential: 99.991785 out of
48691.000000<br>
2009-09-16 00:38:52+0200 [-] XXX sequential: 99.993838 out of
48682.000000<br>
2009-09-16 00:48:52+0200 [-] XXX sequential: 99.989746 out of
48762.000000<br>
2009-09-16 00:58:52+0200 [-] XXX sequential: 99.993848 out of
48768.000000<br>
2009-09-16 01:08:52+0200 [-] XXX sequential: 99.987645 out of
48563.000000<br>
2009-09-16 01:18:52+0200 [-] XXX sequential: 99.993791 out of
48315.000000<br>
2009-09-16 01:28:52+0200 [-] XXX sequential: 99.993836 out of
48667.000000<br>
2009-09-16 01:38:52+0200 [-] XXX sequential: 99.997943 out of
48622.000000<br>
2009-09-16 01:48:52+0200 [-] XXX sequential: 100.000000 out of
48700.000000<br>
2009-09-16 01:58:52+0200 [-] XXX sequential: 99.991787 out of
48706.000000<br>
2009-09-16 02:08:52+0200 [-] XXX sequential: 99.993803 out of
48412.000000<br>
2009-09-16 02:18:52+0200 [-] XXX sequential: 99.991786 out of
48700.000000<br>
2009-09-16 02:28:52+0200 [-] XXX sequential: 99.985670 out of
48849.000000<br>
2009-09-16 02:38:52+0200 [-] XXX sequential: 99.993847 out of
48760.000000<br>
2009-09-16 02:48:52+0200 [-] XXX sequential: 99.989764 out of
48845.000000<br>
2009-09-16 02:58:52+0200 [-] XXX sequential: 99.987708 out of
48811.000000<br>
2009-09-16 03:08:52+0200 [-] XXX sequential: 99.993821 out of
48552.000000<br>
2009-09-16 03:18:52+0200 [-] XXX sequential: 99.991775 out of
48634.000000<br>
2009-09-16 03:28:52+0200 [-] XXX sequential: 99.989757 out of
48813.000000<br>
2009-09-16 03:38:52+0200 [-] XXX sequential: 99.985646 out of
48767.000000<br>
2009-09-16 03:48:52+0200 [-] XXX sequential: 99.993854 out of
48816.000000<br>
2009-09-16 03:58:52+0200 [-] XXX sequential: 99.989767 out of
48863.000000<br>
2009-09-16 04:08:52+0200 [-] XXX sequential: 99.995847 out of
48157.000000<br>
2009-09-16 04:18:52+0200 [-] XXX sequential: 100.000000 out of
47829.000000<br>
2009-09-16 04:28:52+0200 [-] XXX sequential: 99.991659 out of
47956.000000<br>
2009-09-16 04:38:52+0200 [-] XXX sequential: 99.997918 out of
48025.000000<br>
2009-09-16 04:48:52+0200 [-] XXX sequential: 99.995839 out of
48065.000000<br>
2009-09-16 04:58:52+0200 [-] XXX sequential: 99.991676 out of
48052.000000<br>
2009-09-16 05:08:52+0200 [-] XXX sequential: 99.989592 out of
48042.000000<br>
2009-09-16 05:18:52+0200 [-] XXX sequential: 99.983612 out of
48816.000000<br>
2009-09-16 05:28:52+0200 [-] XXX sequential: 99.987711 out of
48826.000000<br>
2009-09-16 05:38:52+0200 [-] XXX sequential: 99.987700 out of
48781.000000<br>
2009-09-16 05:48:52+0200 [-] XXX sequential: 99.991803 out of
48796.000000<br>
2009-09-16 05:58:52+0200 [-] XXX sequential: 99.991793 out of
48740.000000<br>
2009-09-16 06:08:52+0200 [-] XXX sequential: 99.995901 out of
48796.000000<br>
2009-09-16 06:18:52+0200 [-] XXX sequential: 99.991815 out of
48871.000000<br>
2009-09-16 06:28:52+0200 [-] XXX sequential: 99.993864 out of
48892.000000<br>
2009-09-16 06:38:52+0200 [-] XXX sequential: 99.987697 out of
48767.000000<br>
2009-09-16 06:48:52+0200 [-] XXX sequential: 99.987702 out of
48790.000000<br>
2009-09-16 06:58:52+0200 [-] XXX sequential: 99.991809 out of
48834.000000<br>
2009-09-16 07:08:52+0200 [-] XXX sequential: 99.997945 out of
48650.000000<br>
2009-09-16 07:18:52+0200 [-] XXX sequential: 99.991786 out of
48698.000000<br>
2009-09-16 07:28:52+0200 [-] XXX sequential: 99.989733 out of
48701.000000<br>
2009-09-16 07:38:52+0200 [-] XXX sequential: 99.993821 out of
48551.000000<br>
2009-09-16 07:48:52+0200 [-] XXX sequential: 99.985591 out of
48582.000000<br>
2009-09-16 07:58:52+0200 [-] XXX sequential: 99.995873 out of
48461.000000<br>
2009-09-16 08:08:52+0200 [-] XXX sequential: 99.997943 out of
48608.000000<br>
2009-09-16 08:18:52+0200 [-] XXX sequential: 99.993842 out of
48718.000000<br>
2009-09-16 08:28:52+0200 [-] XXX sequential: 99.989735 out of
48710.000000<br>
2009-09-16 08:38:52+0200 [-] XXX sequential: 99.995881 out of
48551.000000<br>
2009-09-16 08:48:52+0200 [-] XXX sequential: 99.991781 out of
48667.000000<br>
2009-09-16 08:58:52+0200 [-] XXX sequential: 100.000000 out of
48660.000000<br>
2009-09-16 09:08:52+0200 [-] XXX sequential: 99.995883 out of
48578.000000<br>
2009-09-16 09:18:52+0200 [-] XXX sequential: 99.991760 out of
48544.000000<br>
2009-09-16 09:28:52+0200 [-] XXX sequential: 99.991715 out of
48279.000000<br>
2009-09-16 09:38:52+0200 [-] XXX sequential: 99.987506 out of
48023.000000<br>
2009-09-16 09:48:52+0200 [-] XXX sequential: 99.966567 out of
47857.000000<br>
2009-09-16 09:58:52+0200 [-] XXX sequential: 99.985362 out of
47820.000000<br>
2009-09-16 10:08:52+0200 [-] XXX sequential: 99.993761 out of
48088.000000<br>
2009-09-16 10:18:52+0200 [-] XXX sequential: 99.981277 out of
48069.000000<br>
2009-09-16 10:28:52+0200 [-] XXX sequential: 99.981191 out of
47850.000000<br>
2009-09-16 10:38:52+0200 [-] XXX sequential: 99.991636 out of
47824.000000<br>
2009-09-16 10:48:52+0200 [-] XXX sequential: 99.133225 out of
47994.000000<br>
2009-09-16 10:58:52+0200 [-] XXX sequential: 99.355925 out of
47510.000000<br>
2009-09-16 11:08:52+0200 [-] XXX sequential: 99.970744 out of
47853.000000<br>
2009-09-16 11:18:52+0200 [-] XXX sequential: 99.974811 out of
47640.000000<br>
2009-09-16 11:28:52+0200 [-] XXX sequential: 99.970220 out of
47012.000000<br>
2009-09-16 11:38:52+0200 [-] XXX sequential: 99.966165 out of
47288.000000<br>
2009-09-16 11:48:52+0200 [-] XXX sequential: 99.520686 out of
47568.000000<br>
2009-09-16 11:58:52+0200 [-] XXX sequential: 99.575127 out of
47779.000000<br>
2009-09-16 12:08:52+0200 [-] XXX sequential: 99.896959 out of
47554.000000<br>
2009-09-16 12:18:52+0200 [-] XXX sequential: 99.323040 out of
47861.000000<br>
2009-09-16 12:28:52+0200 [-] XXX sequential: 99.396808 out of
47746.000000<br>
2009-09-16 12:38:52+0200 [-] XXX sequential: 98.885220 out of
47543.000000<br>
2009-09-16 12:48:52+0200 [-] XXX sequential: 99.117734 out of
47378.000000<br>
2009-09-16 12:58:52+0200 [-] XXX sequential: 99.300862 out of
47201.000000<br>
2009-09-16 13:08:52+0200 [-] XXX sequential: 99.126166 out of
47263.000000<br>
2009-09-16 13:18:52+0200 [-] XXX sequential: 99.153883 out of
47393.000000<br>
2009-09-16 13:28:52+0200 [-] XXX sequential: 98.976261 out of
47180.000000<br>
2009-09-16 13:38:52+0200 [-] XXX sequential: 99.243430 out of
47451.000000<br>
2009-09-16 13:48:52+0200 [-] XXX sequential: 98.913250 out of
47297.000000<br>
2009-09-16 13:58:52+0200 [-] XXX sequential: 99.069846 out of
47304.000000<br>
2009-09-16 14:08:52+0200 [-] XXX sequential: 98.965437 out of
47363.000000<br>
2009-09-16 14:18:52+0200 [-] XXX sequential: 98.784528 out of
47389.000000<br>
2009-09-16 14:28:52+0200 [-] XXX sequential: 98.970310 out of
47490.000000<br>
2009-09-16 14:38:52+0200 [-] XXX sequential: 98.614124 out of
47479.000000<br>
2009-09-16 14:48:52+0200 [-] XXX sequential: 98.742204 out of
47623.000000<br>
2009-09-16 14:58:52+0200 [-] XXX sequential: 98.644524 out of
47511.000000<br>
2009-09-16 15:08:52+0200 [-] XXX sequential: 98.776360 out of
47563.000000<br>
2009-09-16 15:18:52+0200 [-] XXX sequential: 98.802520 out of
47934.000000<br>
2009-09-16 15:28:52+0200 [-] XXX sequential: 98.791915 out of
47596.000000<br>
2009-09-16 15:38:52+0200 [-] XXX sequential: 98.591431 out of
47708.000000<br>
2009-09-16 15:48:52+0200 [-] XXX sequential: 98.838642 out of
47875.000000<br>
2009-09-16 15:58:52+0200 [-] XXX sequential: 98.554277 out of
47727.000000<br>
2009-09-16 16:08:52+0200 [-] XXX sequential: 98.820814 out of
47660.000000<br>
2009-09-16 16:18:52+0200 [-] XXX sequential: 98.758178 out of
47994.000000<br>
2009-09-16 16:28:52+0200 [-] XXX sequential: 98.821362 out of
47767.000000<br>
2009-09-16 16:38:52+0200 [-] XXX sequential: 98.901352 out of
47786.000000<br>
2009-09-16 16:48:52+0200 [-] XXX sequential: 98.701408 out of
47744.000000<br>
2009-09-16 16:58:52+0200 [-] XXX sequential: 98.630137 out of
47742.000000<br>
2009-09-16 17:08:52+0200 [-] XXX sequential: 98.525500 out of
47745.000000<br>
2009-09-16 17:18:52+0200 [-] XXX sequential: 98.724129 out of
48124.000000<br>
2009-09-16 17:28:52+0200 [-] XXX sequential: 98.679048 out of
47920.000000<br>
2009-09-16 17:38:52+0200 [-] XXX sequential: 98.808527 out of
47756.000000<br>
2009-09-16 17:48:52+0200 [-] XXX sequential: 98.703562 out of
48209.000000<br>
2009-09-16 17:58:52+0200 [-] XXX sequential: 98.599278 out of
48475.000000<br>
2009-09-16 18:08:52+0200 [-] XXX sequential: 98.465473 out of
48484.000000<br>
2009-09-16 18:18:52+0200 [-] XXX sequential: 98.427003 out of
48379.000000<br>
2009-09-16 18:28:52+0200 [-] XXX sequential: 98.434754 out of
48363.000000<br>
2009-09-16 18:38:52+0200 [-] XXX sequential: 98.201021 out of
48194.000000<br>
2009-09-16 18:48:52+0200 [-] XXX sequential: 98.503921 out of
48460.000000<br>
2009-09-16 18:58:52+0200 [-] XXX sequential: 98.612860 out of
48445.000000<br>
2009-09-16 19:08:52+0200 [-] XXX sequential: 98.349281 out of
48282.000000<br>
2009-09-16 19:18:52+0200 [-] XXX sequential: 98.203753 out of
48490.000000<br>
2009-09-16 19:28:52+0200 [-] XXX sequential: 98.276146 out of
48496.000000<br>
2009-09-16 19:38:52+0200 [-] XXX sequential: 98.096699 out of
48232.000000<br>
2009-09-16 19:48:52+0200 [-] XXX sequential: 98.128469 out of
48463.000000<br>
2009-09-16 19:58:52+0200 [-] XXX sequential: 98.435858 out of
48525.000000<br>
2009-09-16 20:08:52+0200 [-] XXX sequential: 98.236776 out of
48434.000000<br>
2009-09-16 20:18:52+0200 [-] XXX sequential: 98.078709 out of
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2009-09-16 20:28:52+0200 [-] XXX sequential: 98.240040 out of
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2009-09-16 20:38:52+0200 [-] XXX sequential: 98.357834 out of
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2009-09-16 20:48:52+0200 [-] XXX sequential: 98.198997 out of
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2009-09-16 20:58:52+0200 [-] XXX sequential: 98.288891 out of
48565.000000<br>
2009-09-16 21:08:52+0200 [-] XXX sequential: 98.235064 out of
48557.000000<br>
2009-09-16 21:18:52+0200 [-] XXX sequential: 98.209793 out of
48486.000000<br>
2009-09-16 21:28:52+0200 [-] XXX sequential: 98.274264 out of
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2009-09-16 21:38:52+0200 [-] XXX sequential: 98.264584 out of
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2009-09-16 21:48:52+0200 [-] XXX sequential: 98.167474 out of
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2009-09-16 21:58:52+0200 [-] XXX sequential: 98.548094 out of
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2009-09-16 22:08:52+0200 [-] XXX sequential: 98.524054 out of
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2009-09-16 22:18:52+0200 [-] XXX sequential: 98.486842 out of
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2009-09-16 22:28:52+0200 [-] XXX sequential: 98.758212 out of
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2009-09-16 22:38:52+0200 [-] XXX sequential: 98.849142 out of
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2009-09-16 22:48:52+0200 [-] XXX sequential: 98.645868 out of
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2009-09-16 22:58:52+0200 [-] XXX sequential: 98.734775 out of
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2009-09-16 23:08:52+0200 [-] XXX sequential: 98.990086 out of
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2009-09-16 23:18:52+0200 [-] XXX sequential: 99.279054 out of
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2009-09-16 23:28:52+0200 [-] XXX sequential: 99.287591 out of
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2009-09-16 23:38:52+0200 [-] XXX sequential: 99.123892 out of
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2009-09-16 23:48:52+0200 [-] XXX sequential: 99.099524 out of
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2009-09-16 23:58:52+0200 [-] XXX sequential: 99.306156 out of
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2009-09-17 00:08:52+0200 [-] XXX sequential: 99.397281 out of
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2009-09-17 00:18:52+0200 [-] XXX sequential: 99.306040 out of
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2009-09-17 00:28:52+0200 [-] XXX sequential: 99.403820 out of
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2009-09-17 00:38:52+0200 [-] XXX sequential: 99.586998 out of
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2009-09-17 00:48:52+0200 [-] XXX sequential: 99.526144 out of
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2009-09-17 00:58:52+0200 [-] XXX sequential: 99.297131 out of
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2009-09-17 01:08:52+0200 [-] XXX sequential: 99.678953 out of
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2009-09-17 01:18:52+0200 [-] XXX sequential: 99.604605 out of
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2009-09-17 01:28:52+0200 [-] XXX sequential: 99.608828 out of
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2009-09-17 01:38:52+0200 [-] XXX sequential: 99.535810 out of
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2009-09-17 01:48:52+0200 [-] XXX sequential: 99.719072 out of
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2009-09-17 01:58:52+0200 [-] XXX sequential: 99.624492 out of
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2009-09-17 02:08:52+0200 [-] XXX sequential: 99.719686 out of
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2009-09-17 02:18:52+0200 [-] XXX sequential: 99.589735 out of
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2009-09-17 02:28:52+0200 [-] XXX sequential: 99.510787 out of
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2009-09-17 02:38:52+0200 [-] XXX sequential: 99.725201 out of
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2009-09-17 02:48:52+0200 [-] XXX sequential: 99.569363 out of
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2009-09-17 02:58:52+0200 [-] XXX sequential: 99.782751 out of
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2009-09-17 03:08:52+0200 [-] XXX sequential: 99.862114 out of
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2009-09-17 03:18:52+0200 [-] XXX sequential: 99.761346 out of
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2009-09-17 03:28:52+0200 [-] XXX sequential: 99.700427 out of
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2009-09-17 03:38:52+0200 [-] XXX sequential: 99.608165 out of
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2009-09-17 03:48:52+0200 [-] XXX sequential: 99.813746 out of
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2009-09-17 03:58:52+0200 [-] XXX sequential: 99.838188 out of
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2009-09-17 04:08:52+0200 [-] XXX sequential: 99.638736 out of
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2009-09-17 04:18:52+0200 [-] XXX sequential: 99.807551 out of
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2009-09-17 04:28:52+0200 [-] XXX sequential: 99.840288 out of
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2009-09-17 04:58:52+0200 [-] XXX sequential: 99.647707 out of
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2009-09-17 05:18:52+0200 [-] XXX sequential: 99.635433 out of
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2009-09-17 06:38:52+0200 [-] XXX sequential: 99.477052 out of
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2009-09-17 06:58:52+0200 [-] XXX sequential: 99.476311 out of
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2009-09-17 07:08:52+0200 [-] XXX sequential: 99.448843 out of
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2009-09-17 07:18:52+0200 [-] XXX sequential: 99.117605 out of
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2009-09-17 07:28:52+0200 [-] XXX sequential: 99.275496 out of
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2009-09-17 07:38:52+0200 [-] XXX sequential: 99.189400 out of
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2009-09-17 07:48:52+0200 [-] XXX sequential: 99.452787 out of
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2009-09-17 07:58:52+0200 [-] XXX sequential: 98.805588 out of
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2009-09-17 08:08:52+0200 [-] XXX sequential: 98.743133 out of
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2009-09-17 08:18:52+0200 [-] XXX sequential: 98.583287 out of
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2009-09-17 08:28:52+0200 [-] XXX sequential: 98.713679 out of
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2009-09-17 08:38:52+0200 [-] XXX sequential: 99.015238 out of
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2009-09-17 08:48:52+0200 [-] XXX sequential: 98.766275 out of
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2009-09-17 08:58:52+0200 [-] XXX sequential: 98.907511 out of
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2009-09-17 09:08:52+0200 [-] XXX sequential: 98.878644 out of
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2009-09-17 09:48:52+0200 [-] XXX sequential: 98.632922 out of
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2009-09-17 09:58:52+0200 [-] XXX sequential: 98.540040 out of
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2009-09-17 10:08:52+0200 [-] XXX sequential: 98.419498 out of
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2009-09-17 10:18:52+0200 [-] XXX sequential: 98.651765 out of
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2009-09-17 10:28:52+0200 [-] XXX sequential: 98.481359 out of
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2009-09-17 10:38:52+0200 [-] XXX sequential: 98.181360 out of
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2009-09-17 10:48:52+0200 [-] XXX sequential: 98.563857 out of
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2009-09-17 10:58:52+0200 [-] XXX sequential: 98.635701 out of
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2009-09-17 11:08:52+0200 [-] XXX sequential: 98.518706 out of
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2009-09-17 11:18:52+0200 [-] XXX sequential: 98.671398 out of
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2009-09-17 11:28:52+0200 [-] XXX sequential: 98.473282 out of
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2009-09-17 11:38:52+0200 [-] XXX sequential: 98.508940 out of
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2009-09-17 11:48:52+0200 [-] XXX sequential: 98.503558 out of
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2009-09-17 11:58:52+0200 [-] XXX sequential: 98.334840 out of
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2009-09-17 12:08:52+0200 [-] XXX sequential: 98.269186 out of
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2009-09-17 12:18:52+0200 [-] XXX sequential: 97.525567 out of
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2009-09-17 12:28:52+0200 [-] XXX sequential: 98.173315 out of
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2009-09-17 12:38:52+0200 [-] XXX sequential: 98.655575 out of
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2009-09-17 12:48:52+0200 [-] XXX sequential: 98.342261 out of
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2009-09-17 12:58:52+0200 [-] XXX sequential: 98.327035 out of
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2009-09-17 13:08:53+0200 [-] XXX sequential: 98.568464 out of
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2009-09-17 13:18:53+0200 [-] XXX sequential: 98.509520 out of
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2009-09-17 13:28:53+0200 [-] XXX sequential: 98.442592 out of
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2009-09-17 13:38:53+0200 [-] XXX sequential: 98.241431 out of
46970.000000<br>
2009-09-17 13:48:53+0200 [-] XXX sequential: 98.395143 out of
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2009-09-17 13:58:53+0200 [-] XXX sequential: 98.342319 out of
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2009-09-17 14:08:53+0200 [-] XXX sequential: 98.218475 out of
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2009-09-17 14:18:53+0200 [-] XXX sequential: 97.218942 out of
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2009-09-17 14:28:53+0200 [-] XXX sequential: 97.923539 out of
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2009-09-17 14:38:53+0200 [-] XXX sequential: 98.139081 out of
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2009-09-17 14:48:53+0200 [-] XXX sequential: 97.903838 out of
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2009-09-17 14:58:53+0200 [-] XXX sequential: 98.127106 out of
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2009-09-17 15:08:53+0200 [-] XXX sequential: 97.960124 out of
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2009-09-17 15:18:53+0200 [-] XXX sequential: 97.968374 out of
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2009-09-17 15:28:53+0200 [-] XXX sequential: 97.993451 out of
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2009-09-17 15:38:53+0200 [-] XXX sequential: 97.882164 out of
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2009-09-17 15:48:53+0200 [-] XXX sequential: 97.816511 out of
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2009-09-17 15:58:53+0200 [-] XXX sequential: 97.877503 out of
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2009-09-17 16:08:53+0200 [-] XXX sequential: 97.919224 out of
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2009-09-17 16:18:53+0200 [-] XXX sequential: 98.372407 out of
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2009-09-17 16:28:53+0200 [-] XXX sequential: 97.971343 out of
46829.000000<br>
2009-09-17 16:38:53+0200 [-] XXX sequential: 97.862177 out of
47104.000000<br>
<br>
The netstat output may be important:<br>
netstat -s -p udp<br>
udp:<br>
2952534541 datagrams received<br>
0 with incomplete header<br>
0 with bad data length field<br>
2154 with bad checksum<br>
3918458 with no checksum<br>
7911265 dropped due to no socket<br>
19 broadcast/multicast datagrams undelivered<br>
7015112 dropped due to full socket buffers<br>
0 not for hashed pcb<br>
2937605991 delivered<br>
3090340606 datagrams output<br>
0 times multicast source filter matched<br>
<br>
Here, "dropped due to no socket" grows constantly (5-20 packets per
sec), but setting net.inet.udp.log_in_vain to 1 (which logs which
packets were dropped) tells that these packets are the ones, which come
back from the authoritative DNS servers, not the one, coming for port
53 (obviously unbound closed the socket, due to a timeout).<br>
The other (and more interesting stuff) is "dropped due to full socket
buffers".<br>
That counter has grown 0 to 130 drops per second (the exact value of
course moves with the actual query rate, so at nights, it is low, while
at daytime, it's at its peak) originally. With increasing SO_RCVBUF I
could push it down to 0 to 2-3 drops per second.<br>
The counters are queried about every five minutes, so this is about a
five minutes average, as I've said, the drops come in batches, like
this (there is one second sleep between every printouts):<br>
fullsockbufs.value 11939010<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939028<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939036<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939065<br>
fullsockbufs.value 11939092<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
fullsockbufs.value 11939093<br>
^C<br>
<br>
Should multi threading help this (so the cache management could run in
its own thread, so maybe it doesn't affect other threads' performance
-I don't know about the details)?<br>
BTW, with threading I have two problems:<br>
- it slows down normal operation (at least on FreeBSD, so it means
lower qps)<br>
- it increases the cache memory usage, which of course makes the hit
ratio slightly worse<br>
<br>
So to summarize the above:<br>
- I think it would be good to have a receive socket size configuration
option, which would make possible to change SO_RCVBUF size only on the
listening socket(s). The patch is trivial, but I'm sure you can do it
better/faster :)<br>
- what could be done to make unbound not block for about a second and
drop a lot of queries (is it possible with some cache tuning, or is
changing code needed, or is is just an impossible thing with an
unthreaded application?)<br>
<br>
ps: using memcached as unbound's cache store is a long time request on
my part, I would be curious whether it's affected by the same problems,
or not (it also have an asynchronous mono threaded run-mode)...<br>
<br>
Thanks and sorry for the long message.<br>
<br>
On 08/14/09 08:57, W.C.A. Wijngaards wrote:
<blockquote cite="mid:4A850AC4.5080809@nlnetlabs.nl" type="cite">
<pre wrap="">-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi Felix,
Can you tell me the names of the queries (off-list ? ).
Perhaps they are misconfigured domains of some sort.
I believe I solved Attila's problems from June.
If you dig for them yourself, do you get an answer?
And with dig +cdflag (to see if they are 'bogus').
Best regards,
Wouter
On 08/13/2009 07:28 PM, Felix Schueren wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello,
and sorry for starting a new thread when the last one is from June - I
subscribed only recently and the mail archive does not show mail ids.
Anyway, I'm referring to the thread from Attila Nagy: "No answers from
unbound occasionally" - we're seeing much the same symptoms (using
1.3.2), i.e. unbound sometimes not answering queries, and debugging is a
pain - we're running a load-balanced setup with currently 3 unbound
nodes, around 22k q/s, each unbound node doing ~6-8k qps. It usually
works fast & fine, but some queries appear to get eaten - we're getting
occasional dns resolution errors when using unbound as cache that we
never got with our dnscache (djb) setup. I've debugged as far as seeing
that the queries reach unbound (they get logged), but I don't know
whether unbound answered and the packets got lost, or if unbound simply
did not answer at all.
Any ideas on debugging this? "Occasionally" means a couple 100 queries
per day (out of roughly 1.1G total queries). My "exceeded" (jostle)
counter is 0, average number of waiting requests is <10 per hosts.
Kind regards,
Felix
</pre>
</blockquote>
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