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Subject: Re: APIC-Errors+Crashes on GA 586DX, 2.2.17/2.4.3
To: kkeil@suse.de (Karsten Keil)
Date: Sun, 22 Apr 2001 00:13:34 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20010421180435.A22420@pingi.muc.suse.de> from "Karsten Keil" at Apr 21, 2001 06:04:35 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> here. These errors itself are not a problem since the APIC bus detect
> it and recover, but if here are double errors in a way that the checksum
> is OK, the APIC may run in trouble.

Also nothing but recent -ac kernels in the 2.4 range handle the replay of
IPI's sometimes caused by this. That patch is a post 2.4.4 thing to sort out.

> I don't know all kinds of events the APIC bus is used for, it is not only
> for the IRQs.

Interrupts from I/O devices and interrupts sent between processors. The latter
are used to tell the other cpus to do things like flush TLB entries, change
an MTRR value etc

Alan

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