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

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Message-Id: <200804212220.20577.jdelvare@suse.de>
Date:	Mon, 21 Apr 2008 22:20:20 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	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

Hi Andi,

Le lundi 21 avril 2008, Andi Kleen a écrit :
> 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)

In my case, booting with noapic works fine, so I don't think that the problem
is related to APIC being disabled.

-- 
Jean Delvare
Suse L3
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