Note on setting higher mbuf and mbuf cluster limits

[Matthew Dillon]

    I've just committed a change to make the kern.ipc.nmbufs and
    kern.ipc.nmbclusters sysctl variables read-only.  These variables
    cannot be adjusted on a running system (like for a year or more now),
    they can ONLY be adjusted as boot-time tunables, i.e. via 
    /boot/loader.conf.

    Having the writable sysctls just made all the statistics programs,
    like netstat -m, report the modified values when the mbuf allocator
    was actually still using the original values.  The result: confusion
    when someone's network seems to stall out due to having many connections
    but netstat -m doesn't report any limits being hit.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>