$ systemd-resolve --status
Global
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 8 (vethJWPPL8)
Current Scopes: LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
Link 4 (lxdbr0)
Current Scopes: LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
Link 3 (eno1)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 192.168.1.1
Link 2 (enp4s0)
Current Scopes: none
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1739672
Title:
Regression in getaddrinfo(): calls block for much longer on Bionic
(compared to Xenial)
Status in glibc package in Ubuntu:
Invalid
Status in linux package in Ubuntu:
Invalid
Status in systemd package in Ubuntu:
New
Bug description:
When testing MAAS on Bionic, we noticed sluggish performance that we
could not immediately explain.
After comparing the results from a run of the test suite on Xenial to
a run on Bionic, we determined that the slowdowns had to do with DNS
lookups. In particular, if MAAS attempts to resolve a hostname using
getaddrinfo() and the call fails, on Xenial the negative result is
returned in a fraction of a second. On Bionic, the negative result is
returned in ~1.6 seconds, according to some measures.
### To run the test ###
git clone https://github.com/mpontillo/test-getaddrinfo
cd test-getaddrinfo
make
### Results on Xenial ###
$ time ./test not-a-real-hostname
Trying to resolve: not-a-real-hostname
getaddrinfo errno: Success
getaddrinfo() return value: -2 (Name or service not known)
real 0m0.015s
user 0m0.000s
sys 0m0.000s
### Results on Bionic ###
$ time ./test not-a-real-hostname
Trying to resolve: not-a-real-hostname
getaddrinfo errno: Resource temporarily unavailable
getaddrinfo() return value: -3 (Temporary failure in name resolution)
real 0m1.609s
user 0m0.004s
sys 0m0.000s
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