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From cove...@apache.org
Subject svn commit: r1031063 - in /httpd/httpd/branches/2.2.x/docs/manual/mod: mod_proxy.html.en mod_proxy.xml
Date Thu, 04 Nov 2010 16:25:38 GMT
Author: covener
Date: Thu Nov  4 16:25:37 2010
New Revision: 1031063

URL: http://svn.apache.org/viewvc?rev=1031063&view=rev
Log:
Merge r1031062 from trunk:

PR#50174: don't offer 120ms as a "typical" TCP keepalive frequency.  Initial keepalive timers
can be
as high as 2 hours (windows/linux/solars defaults via google).  

Drive home the idea that users need
to figure out their OS and Firewall timers and make the former smaller than th elatter.



Modified:
    httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.html.en
    httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.xml

Modified: httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.html.en
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.html.en?rev=1031063&r1=1031062&r2=1031063&view=diff
==============================================================================
--- httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.html.en (original)
+++ httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.html.en Thu Nov  4 16:25:37 2010
@@ -999,12 +999,15 @@ through</td></tr>
     </td></tr>
     <tr><td>keepalive</td>
         <td>Off</td>
-        <td>This parameter should be used when you have a firewall between your
+        <td><p>This parameter should be used when you have a firewall between
your
     Apache and the backend server, who tend to drop inactive connections.
     This flag will tell the Operating System to send <code>KEEP_ALIVE</code>
-    messages on inactive connections (interval depends on global OS settings,
-    generally 120ms), and thus prevent the firewall to drop the connection.
-    To enable keepalive set this property value to <code>On</code>. 
+    messages on inactive connections  and thus prevent the firewall to drop the connection.
+    To enable keepalive set this property value to <code>On</code>. </p>
+    <p>The frequency of initial and subsequent TCP keepalive probes 
+    depends on global OS settings, and may be as high as 2 hours. To be useful,
+    the frequency configured in the OS must be smaller than the threshold used 
+    by the firewall.</p>
     </td></tr>
     <tr><td>lbset</td>
         <td>0</td>

Modified: httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.xml
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.xml?rev=1031063&r1=1031062&r2=1031063&view=diff
==============================================================================
--- httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.xml (original)
+++ httpd/httpd/branches/2.2.x/docs/manual/mod/mod_proxy.xml Thu Nov  4 16:25:37 2010
@@ -847,12 +847,15 @@ expressions</description>
     </td></tr>
     <tr><td>keepalive</td>
         <td>Off</td>
-        <td>This parameter should be used when you have a firewall between your
+        <td><p>This parameter should be used when you have a firewall between
your
     Apache and the backend server, who tend to drop inactive connections.
     This flag will tell the Operating System to send <code>KEEP_ALIVE</code>
-    messages on inactive connections (interval depends on global OS settings,
-    generally 120ms), and thus prevent the firewall to drop the connection.
-    To enable keepalive set this property value to <code>On</code>. 
+    messages on inactive connections  and thus prevent the firewall to drop the connection.
+    To enable keepalive set this property value to <code>On</code>. </p>
+    <p>The frequency of initial and subsequent TCP keepalive probes 
+    depends on global OS settings, and may be as high as 2 hours. To be useful,
+    the frequency configured in the OS must be smaller than the threshold used 
+    by the firewall.</p>
     </td></tr>
     <tr><td>lbset</td>
         <td>0</td>



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