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Document newly introduced tunable dev.bge.%d.forced_udpcsum.

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While I'm here also mention tunable dev.bge.%d.forced_collapse.
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Pyun YongHyeon 2010-08-22 01:40:59 +00:00
parent 35f945cd62
commit 8024e98228
1 changed files with 21 additions and 1 deletions
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share/man/man4/bge.4
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@ -31,7 +31,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 7, 2009
.Dd August 21, 2010
.Dt BGE 4
.Os
.Sh NAME
@ -219,6 +219,26 @@ Allow the ASF feature for cooperating with IPMI.
Can cause system lockup problems on a small number of systems.
Enabled by default.
.El
.Sh SYSCTL VARIABLES
The following variables are available as both
.Xr sysctl 8
variables and
.Xr loader 8
tunables:
.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
effect.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "bge%d: couldn't map memory"