Hi Klaus, 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. Best regards -- Remi Gacogne PowerDNS.COM BV - https://www.powerdns.com/
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