From owner-freebsd-stable  Fri Jun 22 13:46:35 2001
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Date: Fri, 22 Jun 2001 16:45:13 -0400
From: John LoVerso <loverso@infolibria.com>
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To: Eric Parusel <lists@globalrelay.net>
Cc: freebsd-stable@FreeBSD.ORG
Subject: Re: SMP/fxp problem...
References: <200106221638.MAA35061@www.cmass.org> <009a01c0fb5a$5e1189d0$0600020a@frontend>
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> When you say "changing a BIOS settings that limited the number of IRQ
> assignments from a legacy mode", did you mean that you increased the
> limit of IRQ assignments from a legacy mode, or decreased the limit?
> (I think you mean increased, but I'd like to be 100% sure :) )

Increase.  In December I spent a small amount of time tracking down this problem
(I added a trace buffer to see if I could pinpoint the interrupt load at the
time I'd get a "device timeout").  Somewhere I got a hint about it being an SMP
problem with shared IRQs; probably from searching the freebsd-hackers list or
from Intel documentation.

Anyway, I made the change and it solved the problem.

The BIOS setting is:

	PCI IRQs to IO-APIC Mapping:	Enable

		Enabled- BIOS will use all 24 IO APIC pins in
		describing PCI interrupt conditions in the MP table.
		Disabled- Only 16 std ISA IRQs are used.
		Do not enable if OS does not support this feature.

John

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