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On Wed, Mar 23, 2005 at 05:39:00PM +0000, tecneeq@tecneeq.de wrote:
> Architecture: i386
> Machine: i386
> >Description:
>   I try to raise kern.mbuf.nmbclusters from 1024 to 2048 wich,
>   according to the manpage, should be possible. It is not.

sysctl(3) says:
             MBUF_NMBCLUSTERS
		The limit on the number of mbuf clusters.  The variable
		can only be increased, and only increased on machines
		with direct-mapped pool pages

So it's not supposed to work on all machines, and i386 doesn't have
direct-mapped pool pages. It's a bug in sysctl(8).
How to document it in sysctl(8) ? Change "raise only" to "machine dependant" ?


-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
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Index: sysctl.8
===================================================================
RCS file: /cvsroot/src/sbin/sysctl/sysctl.8,v
retrieving revision 1.117
diff -u -r1.117 sysctl.8
--- sysctl.8	21 Nov 2004 22:18:10 -0000	1.117
+++ sysctl.8	23 Mar 2005 18:49:29 -0000
@@ -254,7 +254,7 @@
 .Xr sysctl 3 .
 The changeable column indicates whether a process with appropriate
 privilege can change the value.
-.Bl -column proc.xpidx.rlimit.coredumpsize.hardxxxxxx integerxxx
+.Bl -column proc.xpidx.rlimit.coredumpsize.hardxxxx integerx
 .It Sy Name	Type	Changeable
 .It ddb.fromconsole	integer 	yes
 .It ddb.lines	integer	yes
@@ -317,7 +317,7 @@
 .It kern.mbuf.mcllowat	integer	yes
 .It kern.mbuf.mclsize	integer	no
 .It kern.mbuf.msize	integer	no
-.It kern.mbuf.nmbclusters	integer	raise only
+.It kern.mbuf.nmbclusters	integer	machine dependant
 .It kern.monotonic_clock	integer	no
 .It kern.msgbuf	struct	no
 .It kern.msgbufsize	integer	no

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