Author: bjk (doc committer)
Date: Tue Apr 24 03:30:26 2012
New Revision: 234630
URL: http://svn.freebsd.org/changeset/base/234630
Log:
MFC r233160:
Expound a bit more about the system maximum number of FIBs,
how it may be set, and current limitations on the value.
PR: docs/157453
Approved by: hrs (mentor)
Modified:
stable/7/lib/libc/sys/setfib.2
Directory Properties:
stable/7/lib/libc/ (props changed)
Modified: stable/7/lib/libc/sys/setfib.2
==============================================================================
--- stable/7/lib/libc/sys/setfib.2 Tue Apr 24 03:29:10 2012
(r234629)
+++ stable/7/lib/libc/sys/setfib.2 Tue Apr 24 03:30:26 2012
(r234630)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 9, 2008
+.Dd March 19, 2012
.Dt SETFIB 2
.Os
.Sh NAME
@@ -44,10 +44,28 @@ 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
.Em 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 overidden for a socket with the use
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