linux-kernel - Re: [PATCH 2/3] x86: x2apic/cluster: Make use of lowest priority delivery mode

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Date:	Mon, 21 May 2012 19:34:28 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/3] x86: x2apic/cluster: Make use of lowest priority
 delivery mode

On Mon, May 21, 2012 at 04:59:04PM +0200, Ingo Molnar wrote:
> 
> When a device is generating ten thousand irqs a second then 
> round-robining the IRQs is equivalent to switching a CPU every 
> 100 usecs.
> 

As far as I remember it's even more complex, with lowprio it
might be not complete fair round-robin, since if focused
processor found then it'll be assigned to handle incoming
irq again.

	Cyrill
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