BIND9 queryperf

bind-9.x.y/contrib/queryperf
./configure -> make
% querperf -s server_addr -l running_time < query_data
run for running_time seconds
keep sending queries from query_data to server_addr for running_time sec
collecting packet loss
controlling send rate so that almost all packets will be responded
dump the final result
queries per second the server could handle
packet loss rate