From owner-freebsd-acpi@FreeBSD.ORG  Wed Sep 28 00:23:43 2005
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Date: Tue, 27 Sep 2005 17:23:38 -0700
From: Nate Lawson <nate@root.org>
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To: jesse <marquezjesse@gmail.com>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: Performance gain?
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jesse wrote:
> Is there any performance gain when using Standard-PC HAL over ACPI-PC 
> HAL? I'm running FreeBSD 5.4-STABLE on a abit KR7A(KT266A) motherboard. 
> I currently have APIC disabled in the bios, ACPI disabled at boot and I 
> feel like my system is snappier. Just wondering if there is any truth to 
> this.

There should be no difference.  The implementation of ACPI on some 
boards will block interrupts while the embedded controller is being 
polled.  But yours is not a laptop so it doesn't have an EC.

If you can enable fine grained profiling (config -g -g KERNELNAME) and 
then run gprof(8), perhaps you can see where the performance is going.

-- 
Nate