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Re: [Xen-devel] Freeze with and xen-4.0.1rc5, acpi problems

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Freeze with and xen-4.0.1rc5, acpi problems
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 24 Aug 2010 01:49:34 -0700
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Claus Rosenberger <Claus.Rosenberger@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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 On 08/24/2010 01:16 AM, Pasi Kärkkäinen wrote:
> On Tue, Aug 24, 2010 at 09:50:19AM +0200, Claus Rosenberger wrote:
>>>>> but thats not a pvops kernel.
>>>> Does someone have ideas why the system would silently lockup (freeze)
>>>> without those "acpi=ht noapic noirqbalance" options? 
>>>> Afaik this is an Intel DQ45CB motherboard, which has been used by many 
>>>> people/developers.
>>> Oh, one more thing.. 
>>> Claus: Please try those options separately,
>>> to figure out which one of those is the important one.
>>> -- Pasi
>> I checked out these options, following result
>> - acpi=ht noapic     => worked
>> - noapic             => didn't work, disk errors while booting, no 
>> functional system
>> - acpi=ht apic=debug => worked
>> So it seems i definitly need the option acpi=ht or acpi=off or something 
>> like that.
> Keir, Jeremy: Any idea why acpi=ht is needed to make Intel DQ45CB (Q45 
> chipset) work?
> Without "acpi=ht" the system freezes randomly without any 
> log/debug/serialconsole output..

At a random guess, there's something strange about the SCI interrupt. 
When booting native, does "acpi" get irq 9 or something else?  Is there
a BIOS setting relating to SCI or ACPI interrupts?


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