IO-APIC on nforce2

From: Christian Kröner (christian.kroener_at_tu-harburg.de)
Date: 04/12/04

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    To: linux-kernel@vger.kernel.org
    Date:	Mon, 12 Apr 2004 20:39:18 +0200
    
    

    I got a problem using LOCAL APIC and IO-APIC on my uniprocessor nforce2 board.
    With recent kernels (latest -mm and 2.6.5-linus) the timer irq gets set to
    XT-PIC, which results in having a constant hi-load of 15% (after booting) to
    about 25% (after having the system run about 12 h). Earlier versions of -mm
    set the timer-irq to IO-APIC-level (or edge, i dont remember it well) and i
    never had any constant hi-load with these versions. Since mainline kernel
    versions never ever set the timer irq to IO-APIC-{level,edge} i used to patch
    them with the ross' nforce-patches, so that the timer-irq gets to be
    IO-APCI-edge, which worked even though the patch applied with offset. Anyways
    with the latest mm-kernels these patches dont work anymore. I could apply
    them with offset but it seems the code isn't used or something else is wrong
    since the timer-irq stays XT-PIC, which results in the problems above. Could
    anyone point out, how to resolve this problem or tell me what I could do, to
    get my timer-irq right? I'm sure willing to test patches...
    Thanks in advance, christian.
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