From: ebiederm@xmission.com (Eric W. Biederman)
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
Yinghai Lu <yinghai@kernel.org>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR instead of 0x1f
Date: Wed, 13 Jan 2010 12:36:18 -0800 [thread overview]
Message-ID: <m1vdf57nel.fsf@fess.ebiederm.org> (raw)
In-Reply-To: 4B4BDBBA.3090406@zytor.com
"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
next prev parent reply other threads:[~2010-01-13 20:36 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-09 2:09 [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR instead of 0x1f Suresh Siddha
2010-01-09 2:19 ` H. Peter Anvin
2010-01-09 2:50 ` Yinghai Lu
2010-01-11 22:53 ` Suresh Siddha
2010-01-11 22:57 ` H. Peter Anvin
2010-01-11 23:10 ` Eric W. Biederman
2010-01-11 23:13 ` H. Peter Anvin
2010-01-12 0:06 ` Suresh Siddha
2010-01-12 0:13 ` H. Peter Anvin
2010-01-12 0:28 ` Eric W. Biederman
2010-01-12 0:36 ` H. Peter Anvin
2010-01-12 1:52 ` Eric W. Biederman
2010-01-12 2:17 ` H. Peter Anvin
2010-01-12 2:27 ` Eric W. Biederman
2010-01-12 10:25 ` Alan Cox
2010-01-13 20:36 ` Eric W. Biederman [this message]
2010-01-13 20:38 ` H. Peter Anvin
2010-01-13 20:53 ` H. Peter Anvin
2010-01-13 20:58 ` H. Peter Anvin
2010-01-12 0:42 ` H. Peter Anvin
2010-01-11 23:00 ` Eric W. Biederman
2010-01-11 23:07 ` H. Peter Anvin
2010-01-09 3:07 ` Yinghai Lu
2010-01-09 3:20 ` H. Peter Anvin
2010-01-09 3:23 ` H. Peter Anvin
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