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-rw-r--r--docs/docbook/projdoc/Portability.sgml12
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diff --git a/docs/docbook/projdoc/Portability.sgml b/docs/docbook/projdoc/Portability.sgml
index afafacc5e4..dae267e8b5 100644
--- a/docs/docbook/projdoc/Portability.sgml
+++ b/docs/docbook/projdoc/Portability.sgml
@@ -175,4 +175,16 @@ Corrective Action: Delete the entry after the word loopback
in the line starting 127.0.0.1
</para>
</sect1>
+
+<sect1>
+<title>AIX</title>
+<sect2>
+<title>Sequential Read Ahead</title>
+<!-- From an email by William Jojo <jojowil@hvcc.edu> -->
+<para>
+Disabling Sequential Read Ahead using "vmtune -r 0" improves
+samba performance significally.
+</para>
+</sect2>
+</sect1>
</chapter>