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Message-ID: <86802c440806182335i6434a7ecj512dae852c4a41eb@mail.gmail.com>
Date: Wed, 18 Jun 2008 23:35:58 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86: update mptable v7
Cc: "Len Brown" <lenb@kernel.org>, "Ingo Molnar" <mingo@elte.hu>,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
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On Wed, Jun 18, 2008 at 11:28 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> Yinghai Lu wrote:
>>>
>>> Can somebody clue me into why this concept
>>> is something other than totally insane?
>>
>> for system that have 6 pcie slots and more, with full populated cards.
>> when boot with mptable, BIOS will use irq < 16 for all pci devices,
>> and several devices will share same irq.
>> but when acpi is enabled, irqs are spanned all over.
>>
>> also when pci card with several pci bridges is plugged in, the mptable
>> is totally messed up, some slot will work, and some doesn't work.
>
> And the reason to worry about supporting non-ACPI on such hardware is what?

1. some other os doesn't support acpi well, and still use mptable.
2. show BIOS engineer how to fix mptable.

YH