linux-kernel - Re: Linux 2.6.20-rc6

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Date:	Tue, 30 Jan 2007 09:08:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.20-rc6 - sky2 resume breakage

* Jeff Garzik <jeff@...zik.org> wrote:

> Easy to name an example, as they are pretty generic.  When sharing 
> irqs -- usually ATA is configured to PCI native (IO-APIC-fasteoi) -- 
> any interrupt storm causes the other devices sharing that irq to crap 
> themselves (kernel turns off irq, suggests irqpoll, etc.)

ok. Can you suggest any way for me to reproduce such a bug artificially 
on a test system? [i have both old and new systems, so if you can think 
of a way for me to trigger this i'd be happy to try]

I /think/ my two patches should automatically avoid the 'cap themselves' 
effect you outlined: the absolutely worst case should be that we'll have 
twice the IRQ rate of the optimal one - but no irq storm nor lost 
interrupts should happen due to irq trigger type mismatches, ever - as 
long as the basic mapping of device to IRQ is correct. [ I tried to push 
to include this in v2.6.20 but i lost that argument ;-) ]

	Ingo
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