linux-kernel - Re: Possibly SATA related freeze killed networking and RAID

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Date:	Thu, 29 Nov 2007 18:03:22 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Phillip Susi <psusi@....rr.com>
Cc:	Tejun Heo <htejun@...il.com>, Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, noah <noah123@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: Possibly SATA related freeze killed networking and RAID

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@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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