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<p class="MsoNormal">Hi<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I encountered a weir performance issue:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Virtual DNS running in VM – (Flavor 4 vCPU), in theory, the named process can reach to 400%<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Query Log is On:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When Traffic is 35KQPS, Named Process CPU usage can reach to maximum 260% . but , Even if I increase the traffic to 70KQPS, the named process CPU usage can’t be more than 260% (lot of failure). – still 260% CPU usage, which impact DNS
performance significantly.<o:p></o:p></p>
<p class="MsoNormal">Is there any parameter which impact the performance of DNS? -- No recursive query during my performance test.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Query Log is off:<o:p></o:p></p>
<p class="MsoNormal">Named Process CPU usage can be more than 260%. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Why Query log off/on feature is impacting named CPU Usage ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">rndc status<o:p></o:p></p>
<p class="MsoNormal">version: BIND 9.10.5-S1 <id:041e344> (Unknown)<o:p></o:p></p>
<p class="MsoNormal">boot time: Tue, 13 Feb 2018 06:12:53 GMT<o:p></o:p></p>
<p class="MsoNormal">last configured: Tue, 13 Feb 2018 06:12:53 GMT<o:p></o:p></p>
<p class="MsoNormal">CPUs found: 4<o:p></o:p></p>
<p class="MsoNormal">worker threads: 4<o:p></o:p></p>
<p class="MsoNormal">UDP listeners per interface: 3<o:p></o:p></p>
<p class="MsoNormal">number of zones: 102<o:p></o:p></p>
<p class="MsoNormal">debug level: 0<o:p></o:p></p>
<p class="MsoNormal">xfers running: 0<o:p></o:p></p>
<p class="MsoNormal">xfers deferred: 0<o:p></o:p></p>
<p class="MsoNormal">soa queries in progress: 0<o:p></o:p></p>
<p class="MsoNormal">query logging is OFF<o:p></o:p></p>
<p class="MsoNormal">recursive clients: 0/900/1000<o:p></o:p></p>
<p class="MsoNormal">tcp clients: 0/15000<o:p></o:p></p>
<p class="MsoNormal">server is up and running<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">BR<o:p></o:p></p>
<p class="MsoNormal">Michael<o:p></o:p></p>
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