[CentOS] Re: smp falls back to up mode on quad core

[Julian Echave]

Indeed, it does default to on. I left it explicitly ncpi=on as a reminder
that it MUST be on for the four cpus to be seen.

On Wed, May 28, 2008 at 12:33 PM, Scott Silva <ssilva at sgvwater.com> wrote:

> on 5-28-2008 8:09 AM Julian Echave spake the following:
>
>> Solved it!
>> After quite a lot of messing around...
>> It turns out i was booting with the acpi=off option, but for the BIOS to
>> see the 4 processors acpi has to be on.
>> The problem was that with acpi=on, boot hangs, unless pci=nommconf is
>> added to the boot options.
>>
>> To summarize,
>>
>> I now boot using the options
>>
>> acpi = on pci=nommconf
>>
>> Thanks.
>>
>> Julian.
>>
> Doesn't acpi default to on? So you "should" be able to just have
> pci=nommconf.
>
>
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