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From: Vivek Khera <vivek@khera.org>
Date: Wed, 22 Mar 2006 10:20:02 -0500
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Subject: Re: How do I change kern.ipc.shmmax in FreeBSD 5.x automatically
	after reboot?
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On Mar 22, 2006, at 6:01 AM, Kipp Holger wrote:

> which are set correctly. Unfortunately, the following
> two entries
>
>   kern.ipc.shmmax="512000000"
>   kern.ipc.shmall="65526"
>
> do not change the corresponding values according
> to sysctl, no matter whether I put them in
> /boot/loader.conf or /etc/sysctl.conf.

Here is how I bump up values to run a large-ish postgresql server  
under 6.0-p4:

in /boot/loader.conf I have

kern.ipc.semmni=32
kern.ipc.semmns=512


and in /etc/sysctl.conf I have

# tuning for PostgreSQL
kern.ipc.shm_use_phys=1
kern.ipc.shmmax=1073741824
kern.ipc.shmall=262144
kern.ipc.semmsl=512
kern.ipc.semmap=256


and it works just fine.  IIRC it worked the same in 5.4.