Document two new sysctl variables, dev.sf.%d.int_mod and dev.sf.%d.stats.

Xref vlan(4).
Touchd Dd.

Reviewed by:	brueffer

share/man/man4/sf.4

@@ -30,7 +30,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 16, 2005
+.Dd January 21, 2008
 .Dt SF 4
 .Os
 .Sh NAME
@@ -139,6 +139,23 @@ ANA-69011 32-bit single port 10/100baseTX adapter
 .It
 ANA-62020 64-bit single port 100baseFX adapter
 .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.sf.%d.int_mod
+Maximum amount of time to delay interrupt processing in units of
+102.4us.
+The accepted range is 0 to 31, the default value is 1 (102.4us).
+Value 0 completely disables the interrupt moderation.
+The interface does not need to be brought down and up again before
+a change takes effect.
+.It Va dev.sf.%d.stats
+Display lots of useful MAC counters maintained in the driver.
+.El
 .Sh DIAGNOSTICS
 .Bl -diag
 .It "sf%d: couldn't map memory"
@@ -176,6 +193,7 @@ the network connection (cable).
 .Xr netintro 4 ,
 .Xr ng_ether 4 ,
 .Xr polling 4 ,
+.Xr vlan 4 ,
 .Xr ifconfig 8
 .Rs
 .%T The Adaptec AIC-6915 Programmer's Manual