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[master] more prefetch doc improvement

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This commit is contained in:
Evan Hunt 2014-04-14 16:36:06 -07:00
parent 4f45d802dc
commit efa4dcc9da
1 changed files with 9 additions and 6 deletions
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15
doc/arm/Bv9ARM-book.xml
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@ -8953,17 +8953,20 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
query will take place: when a cache record with a
lower TTL value is encountered during query processing,
it will be refreshed. Valid trigger TTL values are 1 to
10 seconds. Setting a trigger TTL to zero (0) causes
10 seconds. Values larger than 10 seconds will be silently
reduced to 10.
Setting a trigger TTL to zero (0) causes
prefetch to be disabled.
The default trigger TTL is <literal>2</literal>.
</para>
<para>
An optional second argument can be used
to set the smallest <emphasis>original</emphasis>
An optional second argument specifies the "eligibility"
TTL: the smallest <emphasis>original</emphasis>
TTL value that will be accepted for a record to be
eligible for prefetching. The difference between
the trigger TTL and the eligibility TTL must be
at least 6 seconds.
eligible for prefetching. The eligibility TTL must
be at least six seconds longer than the trigger TTL;
if it isn't, <command>named</command> will silently
adjust it upward.
The default eligibility TTL is <literal>9</literal>.
</para>
</listitem>