Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR instead of 0x1f

From: Eric W. Biederman
Date: Wed Jan 13 2010 - 15:36:37 EST

"H. Peter Anvin" <hpa@xxxxxxxxx> writes:

> On 01/11/2010 05:52 PM, Eric W. Biederman wrote:
>> After having the documentation quoted at me. I am having a distinct
>> memory of one piece of documentation saying:
>> "interrupts within a priority level can be delivered in any order"
>> So I am guessing there is not any ordering of interrupts in the same
>> priority level until they get to the local apic.
> There is no ordering of interrupts before they hit the local APIC, since
> the local APIC is what would serialize them...

The io apic serializes them, and sends them over either the 2-wire
bus or the front side bus. How much serialization and prioritization
happens at that point I am not certain, but some certainly happens
before you get to the local apic.


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