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Posted to cvs@httpd.apache.org by el...@apache.org on 2016/06/18 10:23:16 UTC
svn commit: r1748952 -
/httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en
Author: elukey
Date: Sat Jun 18 10:23:16 2016
New Revision: 1748952
URL: http://svn.apache.org/viewvc?rev=1748952&view=rev
Log:
Documentation rebuild
Modified:
httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en
Modified: httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en?rev=1748952&r1=1748951&r2=1748952&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en (original)
+++ httpd/httpd/branches/2.4.x/docs/manual/mod/mpm_common.html.en Sat Jun 18 10:23:16 2016
@@ -279,6 +279,13 @@ in *BSDs.</td></tr>
then make each child handle a single bucket (with round-robin distribution
of the buckets at children creation time).</p>
+ <div class="note"><h3>Meaning of "online" CPU core</h3>
+ <p>On Linux (and also BSD) a CPU core can be turned on/off if
+ <a href="https://www.kernel.org/doc/Documentation/cpu-hotplug.txt">Hotplug</a>
+ is configured, therefore <code class="directive">ListenCoresBucketsRatio</code> needs to
+ take this parameter into account while calculating the number of buckets to create.</p>
+ </div>
+
<p><code class="directive">ListenCoresBucketsRatio</code> can improve the
scalability when accepting new connections is/becomes the bottleneck.
On systems with a large number of CPU cores, enabling this feature has
@@ -288,7 +295,10 @@ in *BSDs.</td></tr>
<p>There must be at least twice the number of CPU cores than the
configured <var>ratio</var> for this to be active. The recommended
<var>ratio</var> is <code>8</code>, hence at least <code>16</code>
- cores should be available at runtime when this value is used.</p>
+ cores should be available at runtime when this value is used.
+ The right <var>ratio</var> to obtain maximum performance needs to be calculated
+ for each target system, testing multiple values and observing the variations in your
+ key performance metrics.</p>
</div>
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