svn commit: r47621 - head/en_US.ISO8859-1/htdocs/news/status

Sun Oct 18 22:06:14 UTC 2015

Author: bjk
Date: Sun Oct 18 22:06:12 2015
New Revision: 47621
URL: https://svnweb.freebsd.org/changeset/doc/47621

Log:
  Add automtud report from jmg

Modified:
  head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml

Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml
==============================================================================

--- head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml	Sun Oct 18 21:54:09 2015	(r47620)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml	Sun Oct 18 22:06:12 2015	(r47621)
@@ -3186,4 +3186,59 @@
     </help>
   </project>
 
+  <project cat='proj'>
+    <title>automtud: Better Jumbo Frame Support</title>
+
+    <contact>
+      <person>
+	<name>
+	  <given>John-Mark</given>
+	  <common>Gurney</common>
+	</name>
+	<email>jmg at FreeBSD.org</email>
+      </person>
+    </contact>
+
+    <links>
+      <url href="https://github.com/jmgurney/automtud">jmgurney/automtud
+	on github</url>
+    </links>
+
+    <body>
+      <p>The <tt>automtud</tt> script will allow a &os; machine to send
+	jumbo frames to machines that support them, while using
+	normal-sized frames for other machines.</p>
+
+      <p>There are various advantages to using jumbo frames,
+	such as reduced protocol overhead.  It also means that TCP streams
+	will not be segmented as much (though TSO helps mitigate the
+	disadvantages of such segmentation) and in cases where LRO does
+	not work well, fewer packets will be received.</p>
+
+      <p>The script currently does not restore the system to its
+	original state when it exits.  This means that you will have to
+	manually change the interface MTU and manually delete host routes
+	after stopping the script.
+      </p>
+    </body>
+
+    <help>
+      <task>
+	<p>Fix up various ethernet drivers to better support jumbo frames.
+	  Most ethernet drivers, though they support scatter/gather, use a
+	  physically contiguous zone to do so, which can cause resource
+	  shortages.</p>
+      </task>
+
+      <task>
+	<p>More testing is needed to ensure that things behave as
+	  expected.  This means that when running the script, communication
+	  to all machines functions normanlly, without slowdown or
+	  connectivity issues.  Check `vmstat -z | grep mbuf' to ensure that
+	  such issues are not due to running out of jumbo_9k or jumbo_16k
+	  buffers due to ethernet driver issue.</p>
+      </task>
+    </help>
+  </project>
+
 </report>
