DNS performance measurement

Maximum performance of queries the server can handle
queryperf
Long-term performance
collect statistics periodically
rndc stats: dump statistics to a file
    +++ Statistics Dump +++ (1125340355)
    success 43
    referral 0
    nxrrset 0
    nxdomain 0
    recursion 74
    failure 40
    duplicate 0
    dropped 0
    --- Statistics Dump --- (1125340355)
    +++ Statistics Dump +++ (1125536915)
    success 257
    referral 0
    nxrrset 28
    ...