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<p class="MsoNormal">Hello BIND Community,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am writing to report a significant performance drop observed after upgrading from BIND 9.18.30 to BIND 9.20.8 .<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are running BIND in a batch data processing environment where large volumes of dynamic DNS updates are pushed periodically.
<o:p></o:p></p>
<p class="MsoNormal">Under 9.18.30, our system consistently achieved a throughput of approximately 16,000 TPS (transactions per second).
<o:p></o:p></p>
<p class="MsoNormal">However, after moving to 9.20.8, the throughput has dropped to around 5,000 TPS, despite using an identical configuration and environment.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><u>Key Environment and Configuration Details:<o:p></o:p></u></b></p>
<p class="MsoNormal"><b><u><o:p><span style="text-decoration:none"> </span></o:p></u></b></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">BIND Version: 9.20.8<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">linked to OpenSSL version: OpenSSL 1.1.1k FIPS 25 Mar 2021<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">compiled with libuv version: 1.48.0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">linked to libuv version: 1.48.0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">compiled with liburcu version: 0.15.0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">compiled with jemalloc version: 5.3.0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">compiled with libxml2 version: 2.9.7<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">linked to libxml2 version: 20907<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">compiled with zlib version: 1.2.11<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">linked to zlib version: 1.2.11<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">Platform: RHEL 8.5, GCC 8.5.0<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">named.configuration<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">options {<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> …<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> zone-statistics no;<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> notify yes;<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> max-cache-size 14297m;<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> max-journal-size 1048576;<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"> …<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">};<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt">ulimit -a<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">core file size (blocks, -c) 0<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">data seg size (kbytes, -d) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">scheduling priority (-e) 0<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">file size (blocks, -f) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">pending signals (-i) 254734<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">max locked memory (kbytes, -l) 64<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">max memory size (kbytes, -m) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">open files (-n) 65536<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">pipe size (512 bytes, -p) 8<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">POSIX message queues (bytes, -q) 819200<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">real-time priority (-r) 0<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">stack size (kbytes, -s) 8192<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">cpu time (seconds, -t) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">max user processes (-u) 65536<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">virtual memory (kbytes, -v) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">file locks (-x) unlimited<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt">cat /proc/mounts | grep nfs<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt">sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><b><u>Use case :</u></b><i><span style="font-size:9.0pt"> <o:p>
</o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal">Trying to load 120M identifier of length 15 digit which will load in zone using nsupdate in a batch of 1000.<o:p></o:p></p>
<p class="MsoNormal">A file created having 120M identifier and sent to nsupdate in a batch of 1000 to add identifier in bind.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Before Upgrade</u> time taken to load data <b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:EN-IN">02 hr 02min 02 second
<o:p></o:p></span></u></b></p>
<p class="MsoNormal"><u><span style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:EN-IN">After Upgrade</span></u><span style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:EN-IN">
</span>time taken to load data <b><u><span style="font-family:"Aptos Narrow",sans-serif;color:black;mso-fareast-language:EN-IN">05 hr 5 min 27 second
<o:p></o:p></span></u></b></p>
<p class="MsoNormal"><span style="mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Questions for the Community:<o:p></o:p></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone else observed a similar TPS drop in 9.20.8 under update loads?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Are there internal configuration or behavioural changes in 9.20.8 affecting update performance?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Are any workarounds or tunings recommended for high-performance batch DNS update use cases in newer versions?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there any known regression or tuning guidance from ISC related to this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any input, confirmation, or suggestions would be highly appreciated. We are open to providing additional logs or traces if needed.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:standardcontextual;mso-fareast-language:EN-IN">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:standardcontextual;mso-fareast-language:EN-IN">Sahil<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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