[Pdns-users] Slow TCP response on authoritative server 2.9.22.

[Augie Schwer]

Hey folks!

I could use some help tracking down a problem I have with one of our
mixed use ( authoritative + recursive ) PowerDNS 2.9.22 name servers.

The server responds to TCP queries, but in the pcaps I have can take
12 to 17 seconds to do so.

I can trigger it with the following from my workstation:

while [ 1 ]; do dig schwer.us +recurse +tcp +short +time=1 +retry=1
@c.ns.sr.sonic.net; date; sleep 1; done;

Perhaps we're hitting some maximum setting, or some internal
throttling? Any help is appreciated, two partial pcaps are attached,
one from my workstation ( augnix ), and one from the server.

A compressed pdns.conf follows:

[/root/augie]_(root at c.ns.sr)_
# grep -v "#" /etc/powerdns/pdns.conf | perl -pe 's/^\s$//'
cache-ttl=300
disable-axfr=yes
launch=gmysql
gmysql-socket=/var/lib/mysql/mysql.sock
gmysql-user=root
gmysql-dbname=pdns
local-address=64.142.56.28,208.201.224.33,208.201.224.11,127.0.0.1,75.101.19.192,75.101.19.193,75.101.19.194,75.101.19.195,75.101.19.196,75.101.19.197,75.101.19.198,75.101.19.199,75.101.19.200,75.101.19.201,75.101.19.202,75.101.19.203,75.101.19.204,75.101.19.205,75.101.19.206,75.101.19.207,75.101.19.208,75.101.19.209,75.101.19.210,75.101.19.211,75.101.19.212,75.101.19.213,75.101.19.214,75.101.19.215,75.101.19.216,75.101.19.217,75.101.19.218,75.101.19.219,75.101.19.220,75.101.19.221,75.101.19.222,75.101.19.223,75.101.19.224,75.101.19.225,75.101.19.226,75.101.19.227,75.101.19.228,75.101.19.229,75.101.19.230,75.101.19.231,75.101.19.232,75.101.19.233,75.101.19.234,75.101.19.235,75.101.19.236,75.101.19.237,75.101.19.238,75.101.19.239,75.101.19.240,75.101.19.241,75.101.19.242,75.101.19.243,75.101.19.244,75.101.19.245,75.101.19.246,75.101.19.247,75.101.19.248,75.101.19.249,75.101.19.250,75.101.19.251,75.101.19.252,75.101.19.253,75.101.19.254
local-port=53
logging-facility=0
max-tcp-connections=1000
negquery-cache-ttl=600
out-of-zone-additional-processing=yes
query-cache-ttl=300
recursive-cache-ttl=300
recursor=127.0.0.1:5300
send-root-referral=no
setgid=pdns
setuid=pdns
webserver=yes
webserver-address=64.142.56.28
webserver-port=8081
version-string=powerdns


-- 
Augie Schwer    -    Augie at Schwer.us    -    http://schwer.us
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