svn commit: r233160 - head/lib/libc/sys
Benjamin Kaduk
bjk at FreeBSD.org
Mon Mar 19 04:46:12 UTC 2012
Author: bjk (doc committer)
Date: Mon Mar 19 04:46:11 2012
New Revision: 233160
URL: http://svn.freebsd.org/changeset/base/233160
Log:
Expound a bit more about the system maximum number of FIBs,
how it may be set, and current limitations on the value.
Approved by: hrs (mentor)
PR: docs/157453
MFC after: 1 week
Modified:
head/lib/libc/sys/setfib.2
Modified: head/lib/libc/sys/setfib.2
==============================================================================
--- head/lib/libc/sys/setfib.2 Mon Mar 19 03:27:08 2012 (r233159)
+++ head/lib/libc/sys/setfib.2 Mon Mar 19 04:46:11 2012 (r233160)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd August 8, 2008
+.Dd March 19, 2012
.Dt SETFIB 2
.Os
.Sh NAME
@@ -45,10 +45,28 @@ subsequent to the call, to be that of th
The
.Fa fib
argument
-may be between 0 and the current system maximum which
+must be greater than or equal to 0
+and less than the current system maximum which
may be retrieved by the
.Va net.fibs
sysctl.
+The system maximum is set in the kernel configuration file with
+.Pp
+.Dl options ROUTETABLES= Ns Em N
+.Pp
+or in
+.Pa /boot/loader.conf
+with
+.Pp
+.Dl net.fibs= Ns Qq Em N
+.Pp
+where
+.Em N
+is an integer.
+However, this maximum is capped at 16 due to the implementation storing
+the fib number in a 4-bit field in
+.Xr mbuf 9
+flags.
The default fib of the process will be applied to all protocol families
that support multiple fibs, and ignored by those that do not.
The default fib for a process may be overridden for a socket with the use
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