Re: "APIC error on CPUx" - what does this mean?

[Rene Rebe <rene.rebe@gmx.net>]

From: Steven Walter <srwalter@yahoo.com>
Subject: Re: "APIC error on CPUx" - what does this mean?
Date: Mon, 7 Jan 2002 11:32:27 -0600

> On Mon, Jan 07, 2002 at 02:16:28PM +0100, Petr Vandrovec wrote:
> > Nope. Probably when CPU is in local APIC mode, it acknowledges interrupts
> > to chipset with different timming, and from time to time CPU still
> > sees IRQ pending, so it asks for vector, but as chipset has no
> > interrupt pending, it answers with IRQ7. I did no analysis to find
> > whether IRQ7 happens directly when we send confirmation to 8259,
> > or whether it happens due to some noise on IRQ line.
> > 
> > AFAIK it happens only on VIA based boards, and only if (AMD) CPU is using 
> > APIC.
> 
> My system is based on AMD's own 750 Irongate chipset, and it produces
> both the initial spurious IRQ7 message and plentiful "ERR" interrupts:

All my machines (from SiS 735, over Intel-BX to older Aladin-5
(super7) boxes) producing such "spurious IRQ7" with the actual 2.4.16
or 2.4.17 kernels ...

> srwalter@hapablap:~$ uptime
>  11:31am  up 42 days, 18:19,  1 user,  load average: 1.04, 1.02, 1.00
> srwalter@hapablap:~$ cat /proc/interrupts | grep ERR
> ERR:      67169
> -- 
> -Steven
> In a time of universal deceit, telling the truth is a revolutionary act.
> 			-- George Orwell
> He's alive.  He's alive!  Oh, that fellow at RadioShack said I was mad!
> Well, who's mad now?
> 			-- Montgomery C. Burns
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