linux-kernel - Re: PCI MSI breaks when booting with nosmp

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Date:	Mon, 21 Apr 2008 20:45:05 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz,
	Jean Delvare <jdelvare@...e.de>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Tejun Heo <htejun@...il.com>,
	Tom Long Nguyen <tom.l.nguyen@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: PCI MSI breaks when booting with nosmp

Jesse Barnes <jbarnes@...tuousgeek.org> writes:
>
> Ok, I see this too on my desktop machine.  It looks like we're not getting 
> interrupts setup correctly in the nosmp case.  Still digging through to see 
> why though...

NoSMP disables the io-apic and a lot of modern systems don't work without APIC.

If you just want to run with a single cpu for testing etc. always use maxcpus=1 
(not 0, that will disable the APIC too)

-Andi
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