[dnsdist] dnsdist performance
remi.gacogne at powerdns.com
Sun Aug 11 16:26:47 UTC 2019
On 8/10/19 10:30 PM, Klaus Darilion wrote:
> I had similar results. Starting 4 listening threads and 4 receivers
> threads (by adding the same backend 4 times) boosted my performance -
> almost linear.
Similar in terms of QPS as well? I just tested master on Arch using
calidns and dumresp as a responder, and I get 55k+ QPS on my 10 year-old
CPU using no tuning, simply:
./dnsdist -C /dev/null -l 127.0.0.1:53 127.0.0.1:54
So one listening thread and one receiver thread.
A quick glance at a perf recording shows that more than 76% of the CPU
time is spent in syscalls, so I'm pretty sure disabling the
meltdown/spectre mitigations would do a big difference, but it's already
pretty far from 5-15K QPS.
If you increase the number of threads you'll need to use ring buffers
sharding to limit contention, by the way.
PowerDNS.COM BV - https://www.powerdns.com/
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