svn commit: r211597 - head/share/man/man4

Pyun YongHyeon yongari at
Sun Aug 22 01:41:00 UTC 2010

Author: yongari
Date: Sun Aug 22 01:40:59 2010
New Revision: 211597

  Document newly introduced tunable dev.bge.%d.forced_udpcsum.
  While I'm here also mention tunable dev.bge.%d.forced_collapse.


Modified: head/share/man/man4/bge.4
--- head/share/man/man4/bge.4	Sun Aug 22 01:39:09 2010	(r211596)
+++ head/share/man/man4/bge.4	Sun Aug 22 01:40:59 2010	(r211597)
@@ -31,7 +31,7 @@
 .\" $FreeBSD$
-.Dd October 7, 2009
+.Dd August 21, 2010
 .Dt BGE 4
@@ -219,6 +219,26 @@ Allow the ASF feature for cooperating wi
 Can cause system lockup problems on a small number of systems.
 Enabled by default.
+The following variables are available as both
+.Xr sysctl 8
+variables and
+.Xr loader 8
+.Bl -tag -width indent
+.It Va dev.bge.%d.forced_collapse
+Allow collapsing multiple transmit buffers into a single buffer
+to increase transmit performance with the cost of CPU cycles.
+The default value is 0 to disable transmit buffer collapsing.
+.It Va dev.bge.%d.forced_udpcsum
+Enable UDP transmit checksum offloading even if controller can generate
+UDP datagrams with checksum value 0.
+UDP datagrams with checksum value 0 can confuse receiver host as it means
+sender did not compute UDP checksum.
+The default value is 0 which disables UDP transmit checksum offloading.
+The interface need to be brought down and up again before a change takes
 .Bl -diag
 .It "bge%d: couldn't map memory"

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