All,After reading the source code ,I think the unbound can run under multiple 
thread mode,each thread have its own select function.
we also know there exist thundering herd problem for some socket function ,such 
as accept(),however, the Linux kernel have solve the problem for accept() since 
version 2.6.*.

So??I think the function select still exist the thundering herd problem,which 
maybe impact the performance.
 




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Best wishes for youFrom Sure Ning
Address:Beijing China
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