RE: 4.9 boot problem on em0 platform.
From: Don Bowman (don_at_sandvine.com)
Date: 02/29/04
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To: 'Deepak Jain' <deepak@ai.net>, freebsd-hackers@freebsd.org Date: Sun, 29 Feb 2004 15:40:44 -0500
> From: Deepak Jain [mailto:deepak@ai.net]
> As a part of tracking down a performance issue, I tried building a
> custom kernel (with just IPFW, DUMMYNET added, NMBCLUSTERS,
> commenting
> out MATH_EMULATE, INET6, I386, I486). The system is currently
> running a
> kernel from a similar machine with the same settings. The
> machine does
> run on this kernel: 4.9-RELEASE FreeBSD 4.9-RELEASE #8, with
> the above
> options, but I have not been able to compile a 4.9-RELEASE #2
> (which is
> the source tree on the machine) kernel that has an identical
> config file.
>
> So, when it builds itself from -RELEASE sources, it hangs at:
>
> "pmap_mapdev: Couldn't alloc kernel virtual memory" I couldn't find a
> reference to anything recent. Nothing non-default (from a GENERIC
> kernel) with respect to ACPI has been touched. I see a reference to
> -CURRENT from 9/03, but that's it.
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.
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