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Date: Wed, 23 Nov 2005 18:56:15 -0700
From: Scott Long <scottl@samsco.org>
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To: Darren Pilgrim <dmp@bitfreak.org>
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Cc: freebsd-current@freebsd.org
Subject: Re: em interrupt storm
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Darren Pilgrim wrote:
> From: Scott Long [mailto:scottl@samsco.org] 
> 
>>Darren Pilgrim wrote:
>>
>>>Until this gets "fixed" in FreeBSD, what should those of us who are
>>>effectively stuck with this hardware do to avoid the problem?
>>
>>What I've done is vacated the use of irq16 on my machines by disabling
>>things like usb and if_em.
> 
> 
> Do the devices have to be really turned off (meaning disabled in the BIOS)
> or do I just not load the corresponding driver?

I think that either works.

> 
> If nothing is using irq16, does the aliasing not occur or does it just
> become transparent to FreeBSD?
> 
> 

If no drivers request a particular interrupt vector, then it gets
masked.  The chipset probably still tries to deliver the interrupt,
but it never makes it to the CPU and thus is transparent.

Scott