David Naylor wrote:
quoted text
> On Wednesday 29 September 2010 18:25:13 Alexander Motin wrote:
>> David Naylor wrote:
>>> On Wednesday 29 September 2010 16:19:08 Andriy Gapon wrote:
>>>> What do you try to actually achieve?
>>> I was trying to boot a system and it was panicking due to stray
>>> interrupts. It turned out to be caused by HPET.  I found
>>> `hint.hpet.0.clock=0' which fixed the problem.
>>>
>>> This means HPET does not work on any of my machines.  The other one's
>>> symptoms are hda losing interrupts after a period of up-time.
>> What chipset do you use? Nvidia MCP5x? Could you send me your verbose
>> dmesg?
> 
> Yes, the one is a MCP51, the other is a ICH8M.  
> 
> The desktop is a Gigabyte N650SLI-DS4L.  Its symptom is hda losing interrupts 
> after a period of time.  

There are too many reports about different lost interrupts problems on
different controllers of MCP5x. I don't know the reason. Attached patch
should disable using regular HPET interrupts on NVidia chipsets. I hope
it will work as workaround. May be it is too aggressive, but better to
be safe then sorry. I assume that legacy_route mode may still work fine
there. It would be nice to test it.

quoted text
> The laptop is a Acer 2920.  Its symptom for a GENERIC is a panic saying stray 
> interrupt (irq7), with a custom kernel booting stalls.  

This is strange, as my Acer with the same ICH8M works fine in all
possible modes. Also IMHO stray interrupts are not a reason to panic.
Could you show what it looks like?

-- 
Alexander Motin