That's what I needed - thanks :)

On 27/09/2021 12:50, Marc wrote:
dnsperf -f inet -t 10 -s 192.168.10.235 -d files.tst -l 30

   Queries sent:         451753
   Queries completed:    451753 (100.00%)
   Queries lost:         0 (0.00%)

   Response codes:       NOERROR 451753 (100.00%)
   Average packet size:  request 30, response 121
   Run time (s):         30.032850
   Queries per second:   15041.962385

   Average Latency (s):  0.006456 (min 0.000714, max 0.148530)
   Latency StdDev (s):   0.007529

Is there any open source tool that benchmarks the DNS server? Sends
pre-defined amount of queries, in parallel to specified DNS servers and
calculates the results, with average response time, error count, time
out count etc. Something like FIO for IO devices, but for DNS?

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