Author: kkolinko
Date: Mon Jan 17 12:00:40 2011
New Revision: 1059898
URL: http://svn.apache.org/viewvc?rev=1059898&view=rev
Log:
Document the conflict between compression and sendfile,
as was discussed on users@
http://markmail.org/thread/bp46zusxjsqqxydr
CTR (docs)
Modified:
tomcat/tc6.0.x/trunk/webapps/docs/config/http.xml
Modified: tomcat/tc6.0.x/trunk/webapps/docs/config/http.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/config/http.xml?rev=1059898&r1=1059897&r2=1059898&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/config/http.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/config/http.xml Mon Jan 17 12:00:40 2011
@@ -276,6 +276,18 @@
the content-length is not known and compression is set to "on" or more
aggressive, the output will also be compressed. If not specified, this
attribute is set to "off".</p>
+ <p><em>Note</em>: There is a tradeoff between using compression (saving
+ your bandwidth) and using the sendfile feature (saving your CPU cycles).
+ If the connector supports the sendfile feature, e.g. the NIO connector,
+ using sendfile will take precedence over compression. The symptoms will
+ be that static files greater that 48 Kb will be sent uncompressed.
+ You can turn off sendfile by setting <code>useSendfile</code> attribute
+ of the connector, as documented below, or change the sendfile usage
+ threshold in the configuration of the
+ <a href="../default-servlet.html">DefaultServlet</a> in the default
+ <code>conf/web.xml</code> or in the <code>web.xml</code> of your web
+ application.
+ </p>
</attribute>
<attribute name="connectionLinger" required="false">
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