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From: Glen Barber <gjb@FreeBSD.org>
Date: Sat, 12 May 2012 18:10:27 +0000 (UTC)
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Subject: svn commit: r235347 - head/share/man/man4
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Author: gjb (doc committer)
Date: Sat May 12 18:10:27 2012
New Revision: 235347
URL: http://svn.freebsd.org/changeset/base/235347

Log:
  Docuement requirement to alter some sysctls when using igb(4) with
  jumbo frames.
  
  PR:		153738
  Submitted by:	Tom Judge (tom!tomjudge.com)
  Discussed with:	jfv (in part, a long time ago...)
  MFC after:	1 week

Modified:
  head/share/man/man4/igb.4

Modified: head/share/man/man4/igb.4
==============================================================================
--- head/share/man/man4/igb.4	Sat May 12 17:42:22 2012	(r235346)
+++ head/share/man/man4/igb.4	Sat May 12 18:10:27 2012	(r235347)
@@ -31,7 +31,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 11, 2011
+.Dd May 12, 2012
 .Dt IGB 4
 .Os
 .Sh NAME
@@ -160,6 +160,14 @@ The minimum is 80, and the maximum is 40
 .It Va hw.igb.enable_aim
 If set to 1, enable Adaptive Interrupt Moderation.
 The default is to enable Adaptive Interrupt Moderation.
+.It Va kern.ipc.nmbclusters
+The maximum number of mbuf clusters allowed.
+If the system has more than one igb card or jumbo frames are
+enabled, this value will need to be increased.
+.It Va kern.ipc.nmbjumbo9k
+The maximum number of mbuf 9k jumbo clusters allowed.
+Increasing this to allow for at least 8192 extra clusters
+per interface can allow for an mtu of 8192.
 .El
 .Sh FILES
 .Bl -tag -width /dev/led/igb*