document the trunc-io option

diff --git a/doc/dbench.1.xml b/doc/dbench.1.xml
index 7800d49ca0a241ec149849d3a78552c80433cc87..7574005ddd1694d139711d7f202fdef26947197f 100644 (file)
--- a/doc/dbench.1.xml
+++ b/doc/dbench.1.xml
@@ -35,6 +35,7 @@
                <arg choice="opt">--export=&lt;string&gt;</arg>
                <arg choice="opt">--protocol=&lt;string&gt;</arg>
                <arg choice="opt">--clients-per-process=&lt;integer&gt;</arg>
+               <arg choice="opt">--trunc-io=&lt;integer&gt;</arg>
                <arg choice="opt">--stat-check</arg>
                <arg choice="opt">--skip-cleanup</arg>
                <arg choice="opt">--per-client-results</arg>
@@ -267,6 +268,18 @@
       </para>
     </refsect2>
 
+    <refsect2><title>--trunc-io=&lt;integer&gt;</title>
+      <para>
+      This option only apply to the "nfs" backend.
+      </para>
+
+      <para>
+      Some NFS server may have limitations on how large READ/WRITE I/Os they
+      accept preventing some loadfiles from running. Using this option will
+      override the length specified in the loadfile and make dbench never
+      issuing any READ/WRITE operations larger than this.
+      </para>
+    </refsect2>
   </refsect1>
 
   <refsect1><title>COPYRIGHT/LICENSE</title>