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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 9. Authoritative Server Performance</title><link rel="stylesheet" href="docbook.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="PowerDNS manual" /><link rel="up" href="index.html" title="PowerDNS manual" /><link rel="prev" href="virtual.html" title="Chapter 8. Virtual hosting" /><link rel="next" href="nptl.html" title="2. Native Posix Thread Library vs LinuxThreads" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 9. Authoritative Server Performance</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="virtual.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="nptl.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 9. Authoritative Server Performance"><div class="titlepage"><div><div><h2 class="title"><a id="performance"></a>Chapter 9. Authoritative Server Performance</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="performance.html#idp7974352">1. General advice</a></span></dt><dt><span class="sect1"><a href="nptl.html">2. Native Posix Thread Library vs LinuxThreads</a></span></dt><dt><span class="sect1"><a href="performance-settings.html">3. Performance related settings</a></span></dt><dd><dl><dt><span class="sect2"><a href="performance-settings.html#packetcache">3.1. Packet Cache</a></span></dt><dt><span class="sect2"><a href="performance-settings.html#querycache">3.2. Query Cache</a></span></dt></dl></dd></dl></div><div class="sect1" title="1. General advice"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="idp7974352"></a>1. General advice</h2></div></div></div><p>
In general, best performance is achieved on recent Linux 2.6 kernels and using MySQL, although many of the largest PowerDNS
installations are based on PostgreSQL. FreeBSD appears to achieve lower packet rates both for the PowerDNS recursor as for the
authoritative nameserver, this is still being investigated. No comparative measurements have been done for Solaris installations.
</p><p>
On Linux, make sure to read <a class="xref" href="nptl.html" title="2. Native Posix Thread Library vs LinuxThreads">Section 2, “Native Posix Thread Library vs LinuxThreads”</a>.
</p><p>
Database servers can require configuration to achieve decent performance. It is especially worth noting that
several vendors ship PostgreSQL with a slow default configuration.
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