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From: Glen Barber <gjb@FreeBSD.org>
Date: Mon, 25 Aug 2014 19:45:40 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r270614 - stable/10/release/doc/en_US.ISO8859-1/relnotes
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Author: gjb
Date: Mon Aug 25 19:45:40 2014
New Revision: 270614
URL: http://svnweb.freebsd.org/changeset/base/270614

Log:
  Document r269846, vfs.zfs.arc_average_blocksize.
  
  Sponsored by:	The FreeBSD Foundation

Modified:
  stable/10/release/doc/en_US.ISO8859-1/relnotes/article.xml

Modified: stable/10/release/doc/en_US.ISO8859-1/relnotes/article.xml
==============================================================================
--- stable/10/release/doc/en_US.ISO8859-1/relnotes/article.xml	Mon Aug 25 19:06:31 2014	(r270613)
+++ stable/10/release/doc/en_US.ISO8859-1/relnotes/article.xml	Mon Aug 25 19:45:40 2014	(r270614)
@@ -498,6 +498,18 @@
 	      keep their active state</para>
 	  </listitem>
 	</itemizedlist>
+
+	<para revision="269846">The default &man.zfs.8;
+	  <acronym>ARC</acronym> hash table size has been increased,
+	  and a new &man.loader.8; tunable,
+	  <literal>vfs.zfs.arc_average_blocksize</literal>, has been
+	  added.  Previously, the hash table could be too small, which
+	  would lead to long hash chains and limit performance for
+	  cached reads.  The
+	  <literal>vfs.zfs.arc_average_blocksize</literal> tunable
+	  allows overriding the default block size.  The previous
+	  default was 65536, and default of the new &man.loader.8;
+	  tunable is 8192.</para>
       </sect3>
     </sect2>