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From: John Baldwin <jhb@freebsd.org>
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Date: Thu, 25 Sep 2008 08:25:19 -0400
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Cc: Bartosz Stec <admin@kkip.pl>
Subject: Re: vm.kmem_size settings doesn't affect loader?
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On Thursday 25 September 2008 06:26:58 am Bartosz Stec wrote:
> 
> Today I've experienced zfs-related kernel panic. Log says:
> 
>     savecore: reboot after panic: kmem_malloc(131072): kmem_map too
>     small: 327684096 total allocated
> 
> Reported amount of memory (327684096) is wrong, because i made suggested 
> tuning in my loader.conf:
> 
>     vm.kmem_size="512M"
>     vm.kmem_size_max="512M"
> 
> Just to be sure:
> 
>     # sysctl vm | grep kmem
>     vm.kmem_size: 536870912
>     vm.kmem_size_min: 0
>     vm.kmem_size_max: 536870912
>     vm.kmem_size_scale: 3
> 
> Am I missing something?

If kvm is fragmented you could have a malloc fail even if there are enough 
total free bytes for the allocatoin.

-- 
John Baldwin