Messages in this thread | | | Subject | Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR instead of 0x1f | From | (Eric W. Biederman) | Date | Wed, 13 Jan 2010 12:36:18 -0800 |
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"H. Peter Anvin" <hpa@zytor.com> 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.
Eric
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