em interrupt storm

[Scott Long]

Darren Pilgrim wrote:
> From: Scott Long [mailto:scottl at 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