Re: cpu error 4 (was: Re: O2 framebuffer problems with install kernel)

On Jul 29, 2008, at 5:42 PM, Michael Lorenz wrote:

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> Hello,
>
> On Jul 29, 2008, at 11:23, Jorge Acereda Maciá wrote:
>
>> With the first patch (the one using BUS_DMA_COHERENT), I get  
>> constant reboots, usually under heavy IO load (probably an  
>> unrelated problem).
>
> Lots of network traffic on the onboard interface?

Yes, I'll try to isolate if it's due to network IO or disk IO.

> Any change with the 2nd patch?

Well, I wanted to keep that machine self-hosting and so far I've been  
unable to checkout the kernel sources :-)
In any case, I still have the cross-building setup on my Mac, so I'll  
try to build a kernel with the second patch.

>
>> I've also noticed messages like this printed occasionally:
>>
>> crime: cpu error 4 at address 4c38444
>
> 'illegal address' reported by crime's cpu error interrupt. Probably  
> a speculative read - otherwise you'd get a segfault or a panic. We  
> should probably ignore them since they're bound to happen on R10k  
> and newer CPUs.

That makes sense. I was wondering why everything kept running happily  
after those messages.