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From st...@apache.org
Subject svn commit: r1379189 - /hbase/trunk/src/docbkx/performance.xml
Date Thu, 30 Aug 2012 22:22:32 GMT
Author: stack
Date: Thu Aug 30 22:22:32 2012
New Revision: 1379189

URL: http://svn.apache.org/viewvc?rev=1379189&view=rev
Log:
Add note on nagles to perf section

Modified:
    hbase/trunk/src/docbkx/performance.xml

Modified: hbase/trunk/src/docbkx/performance.xml
URL: http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/performance.xml?rev=1379189&r1=1379188&r2=1379189&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/performance.xml (original)
+++ hbase/trunk/src/docbkx/performance.xml Thu Aug 30 22:22:32 2012
@@ -139,6 +139,13 @@
     <title>HBase Configurations</title>
 
     <para>See <xref linkend="recommended_configurations" />.</para>
+    <section xml:id="perf.nagels">
+      <title><link xlink:href="http://en.wikipedia.org/wiki/Nagle's_algorithm">Nagle's</link>
or the small package problem</title>
+      <para>If a big 40ms or so occasional delay is seen in operations against HBase,
+      try the Nagles' setting.  For example, see the user mailing list thread,
+      <link xlink:href="http://search-hadoop.com/m/pduLg2fydtE/Inconsistent+scan+performance+with+caching+set+&amp;subj=Re+Inconsistent+scan+performance+with+caching+set+to+1">Inconsistent
scan performance with caching set to 1</link>
+      and the issue cited therein where setting notcpdelay improved scan speeds.</para>
+    </section>
 
     <section xml:id="perf.number.of.regions">
       <title>Number of Regions</title>



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