svn commit: r235590 - stable/8/share/man/man4

Glen Barber gjb at
Fri May 18 02:06:35 UTC 2012

Author: gjb (doc committer)
Date: Fri May 18 02:06:34 2012
New Revision: 235590

  Document requirement to alter some sysctls when using igb(4) with
  jumbo frames.
  PR:		153738

Directory Properties:
  stable/8/share/man/man4/   (props changed)

Modified: stable/8/share/man/man4/igb.4
--- stable/8/share/man/man4/igb.4	Fri May 18 02:06:10 2012	(r235589)
+++ stable/8/share/man/man4/igb.4	Fri May 18 02:06:34 2012	(r235590)
@@ -31,7 +31,7 @@
 .\" $FreeBSD$
-.Dd May 14, 2010
+.Dd May 12, 2012
 .Dt IGB 4
@@ -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.
 .Bl -diag

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