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[master] adjust default -U

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3751.	[tuning]	The default setting for the -U option (setting
			the number of UDP listeners per interface) has
			been adjusted to improve performance. [RT #35417]
This commit is contained in:
Evan Hunt 2014-02-19 21:54:43 -08:00
parent 4a0beb64be
commit 83eecff731
3 changed files with 18 additions and 6 deletions
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4
CHANGES
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@ -1,5 +1,9 @@
--- 9.10.0b1 released --- --- 9.10.0b1 released ---
3751. [tuning] The default setting for the -U option (setting
the number of UDP listeners per interface) has
been adjusted to improve performance. [RT #35417]
3750. [experimental] Partially implement EDNS EXPIRE option as described 3750. [experimental] Partially implement EDNS EXPIRE option as described
in draft-andrews-dnsext-expire-00. Retrivial of in draft-andrews-dnsext-expire-00. Retrivial of
remaining time to expiry from slave zones is supported. remaining time to expiry from slave zones is supported.

10
bin/named/main.c
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@ -646,8 +646,14 @@ create_managers(void) {
#ifdef WIN32 #ifdef WIN32
ns_g_udpdisp = 1; ns_g_udpdisp = 1;
#else #else
if (ns_g_udpdisp == 0) if (ns_g_udpdisp == 0) {
ns_g_udpdisp = ns_g_cpus_detected; if (ns_g_cpus_detected == 1)
ns_g_udpdisp = 1;
else if (ns_g_cpus_detected < 4)
ns_g_udpdisp = 2;
else
ns_g_udpdisp = ns_g_cpus_detected / 2;
}
if (ns_g_udpdisp > ns_g_cpus) if (ns_g_udpdisp > ns_g_cpus)
ns_g_udpdisp = ns_g_cpus; ns_g_udpdisp = ns_g_cpus;
#endif #endif

10
bin/named/named.docbook
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@ -314,10 +314,12 @@
Use <replaceable class="parameter">#listeners</replaceable> Use <replaceable class="parameter">#listeners</replaceable>
worker threads to listen for incoming UDP packets on each worker threads to listen for incoming UDP packets on each
address. If not specified, <command>named</command> will address. If not specified, <command>named</command> will
use the number of detected CPUs. If <option>-n</option> calculate a default value based on the number of detected
has been set to a higher value than the number of CPUs, CPUs: 1 for 1 CPU, 2 for 2-4 CPUs, and the number of
then <option>-U</option> may be increased as high as that detected CPUs divided by 2 for values higher than 4.
value, but no higher. If <option>-n</option> has been set to a higher value than
the number of detected CPUs, then <option>-U</option> may
be increased as high as that value, but no higher.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>