Hi,
it seems that dnsmasq with mostly default parameters can be easily
overwhelmed with tcp dns requests. Even for 64 nearly concurrent
requests some will take longer than a second to be answered [1]. This
gets worse with the number of requests.
Are there any tunables which could improve this?
Regards
Jan
[1]
root@8cb67b32dabb:/# dnsmasq --version
Dnsmasq version 2.86 Copyright (c) 2000-2021 Simon Kelley
Compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP
DHCPv6 no-Lua TFTP conntrack ipset auth cryptohash DNSSEC loop-detect
inotify dumpfile
[...]
root@8cb67b32dabb:/# dnsmasq --no-hosts --no-resolv --local-service --
bind-dynamic --server=1.1.1.1
root@8cb67b32dabb:/# time dig +short +tcp thekelleys.org.uk @127.0.0.1
85.119.82.65
real 0m0.076s
user 0m0.019s
sys 0m0.016s
root@8cb67b32dabb:/# for i in {0..63}; do time dig +short +tcp
thekelleys.org.uk @127.0.0.1 & done | grep -c '85.119.82.65'
real 0m0.064s
user 0m0.012s
sys 0m0.010s
real 0m0.074s
user 0m0.009s
sys 0m0.011s
[...]
real 0m0.359s
user 0m0.014s
sys 0m0.004s
real 0m1.190s
user 0m0.009s
sys 0m0.012s
real 0m1.171s
user 0m0.012s
sys 0m0.007s
real 0m1.192s
user 0m0.009s
sys 0m0.011s
64
--
Jan Horstmann
Systementwickler | Infrastruktur
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