Be more explicit about the performance of UseCanonicalName DNS

after the scoreboard change.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84440 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/core.html b/docs/manual/mod/core.html
index f28e29dbcc46588a19c291d7335250697853c7a9..4a55de51c05959f06495e0d3865c40c494fc904a 100644 (file)
--- a/docs/manual/mod/core.html
+++ b/docs/manual/mod/core.html
@@ -3144,6 +3144,9 @@ is intended for use with mass IP-based virtual hosting to support
 ancient clients that do not provide a <CODE>Host:</CODE> header. With
 this option Apache does a reverse DNS lookup on the server IP address
 that the client connected to in order to work out self-referential URLs.
+This can have adverse performance implications, especially if you use
+<CODE>%V</CODE> in a <A HREF="mod_log_config.html#customlog">CustomLog</A> 
+directive or have <A HREF="mod_status.html">ExtendedStatus</A> on.
 
 <P><STRONG>Warning:</STRONG> if CGIs make assumptions about the values of
 <CODE>SERVER_NAME</CODE> they may be broken by this option.  The client