Date: Thu, 29 Nov 2007 18:03:22 -0600
From: Robert Hancock <hancockr@shaw.ca>
Subject: Re: Possibly SATA related freeze killed networking and RAID
In-reply-to: <fa.0muxGr+d7CjnQ/J5GaB+TSqouuU@ifi.uio.no>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: Tejun Heo <htejun@gmail.com>, Pavel Machek <pavel@ucw.cz>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, noah <noah123@gmail.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-ide@vger.kernel.org
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Phillip Susi wrote:
> Tejun Heo wrote:
>> Agreed.  Nobody cared on ATA controllers is usually very effective at
>> taking the whole machine down.  Is there any reason why we don't turn on
>> irqpoll on turned off IRQs automatically?
> 
> Why does a single spurious interrupt cause it to be shut down?  I can 
> see if the interrupt is stuck on and keeps interrupting constantly, but 
> if it's just the occasional spurious interrupt, why not just ignore it 
> and move on?

I'm not certain offhand, but I think there may be such a threshold. 
However, an occasional spurious interrupt isn't likely. For a 
level-triggered interrupt, an unhandled interrupt will keep interrupting 
forever since nobody knows how to clear it (until we decide to disable 
the IRQ entirely).

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

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