The following reply was made to PR bin/29774; it has been noted by GNATS.

From: Dennis Wecker <dennis@bingo-ev.de>
To: gnats-bugs@netbsd.org
Cc: dennis@bingo-ev.de
Subject: Re: bin/29774: sysctl can't raise kern.mbuf.nmbclusters
Date: Wed, 23 Mar 2005 19:32:28 +0100

 On Wednesday, 23 Mar 2005 - 05:39:00PM +0000, tecneeq@tecneeq.de wrote:
 > >Number:         29774
 > >Category:       bin
 > >Synopsis:       sysctl can't raise kern.mbuf.nmbclusters
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       medium
 > >Responsible:    bin-bug-people
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Wed Mar 23 17:39:00 +0000 2005
 > >Originator:     Karsten Kruse
 > >Release:        NetBSD 3.0_BETA
 > >Organization:
 >         Homepage, Mac68k, A/UX-Links und Shorties: www.tecneeq.de
 >   ()    Linux/NetBSD-Anleitungen, Forum  und Chat: www.newbie-net.de
 >  <\/>
 >  _/\_   NetBSD - because Unix isn't just #include <linux.h>
 > >Environment:
 > 	
 > 	
 > System: NetBSD uberhost.newbie-net.de 3.0_BETA NetBSD 3.0_BETA (UBERHOST) #0: Tue Mar 22 22:29:34 CET 2005 karsten@uberhost.newbie-net.de:/mnt/data3/systems/netbsd/builds/NetBSD-3.0_BETA-x86-obj/sys/arch/i386/compile/UBERHOST i386
 > ident /sbin/sysctl                                         
 > /sbin/sysctl:
 >   $NetBSD: crt0.c,v 1.13 2003/07/26 19:24:27 salo Exp $
 >   $NetBSD: sysctl.c,v 1.97.2.2 2005/03/20 21:49:09 tron Exp $
 > 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.
 > 	
 > >How-To-Repeat:
 >   root@uberhost:~/home/karsten> sysctl kern.mbuf.nmbclusters
 >   kern.mbuf.nmbclusters = 1024
 >   root@uberhost:~/home/karsten> sysctl -w kern.mbuf.nmbclusters=2048
 >   sysctl: kern.mbuf.nmbclusters: sysctl() failed with Operation not permitted
 
 it's not possible to change the nmbclusters on all archs.