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[master] note RPZ performance issues in ARM

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Evan Hunt
2012-10-25 18:04:25 -07:00
parent 814fc913e6
commit e23757501f
1 changed files with 14 additions and 0 deletions
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doc/arm/Bv9ARM-book.xml
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@@ -9874,6 +9874,20 @@ bzone.domain.com CNAME garden.example.com.
ns.domain.com.rpz-nsdname CNAME .
48.zz.2.2001.rpz-nsip CNAME .
</programlisting>
<para>
Note: RPZ may impact server performance. Each configured
response policy zone requires the server to perform one to four
additional database lookups before a query can be answered.
For example, a DNS server with four policy zones, each with all
four kinds of response triggers &mdash; QNAME, IP, NSIP, and
NSDNAME &mdash; requires a total of 17 times as many database
lookups as a similar DNS server with no response policy zones.
A <acronym>BIND9</acronym> server with adequate memory and one
response policy zone with QNAME and IP triggers might achieve a
maximum queries-per-second rate about 20% lower. A server with
four response policy zones with QNAME and IP triggers might
have a maximum QPS rate about 50% lower.
</para>
</sect3>
</sect2>