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From: Don Bowman <don@sandvine.com>
To: 'Deepak Jain' <deepak@ai.net>, Don Bowman <don@sandvine.com>,
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Date: Sun, 29 Feb 2004 16:17:31 -0500
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Subject: RE: 4.9 boot problem on  em0 platform.
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From: Deepak Jain [mailto:deepak@ai.net]
> > Just a guess, but i think you've bumped nmbclusters or nmbufs up
> > too much (or perhaps maxsockets, maxfds, ...) and have run out of
> > KVA.
> > 
> > You can tune clusters & mbufs in loader.conf without recompiling
> > kernel. You will want to see what vm.zone_kmem_pages, 
> vm.zone_kmem_kvaspace
> > are showing you, vmstat -z, vmstat -m, etc.
> > 
> > You may want to alter VM_KMEM_SIZE_SCALE to e.g. '2' if you are
> > trying to put more into the kernel mem space.
> > 
> 
> The kernel that works from another machine has the same settings 
> (NMBCLUSTERS=65536, maxusers=512). The machine has 2GB of RAM.
> 
> How do you undo the loader.conf settings when the machine won't boot 
> because of the settings you made? :|

Use 'space' to get to the 'ok' loader prompt.
now 'set' the values to a lower #...

ok set path.path.path=value


man loader will tell you about this.