Linux 2.6.39-rc3

H. Peter Anvin hpa at
Wed Apr 13 23:10:03 PDT 2011

On 04/13/2011 07:07 PM, Dave Airlie wrote:
>> Okay, staring at this, it definitely seems toxic to overlay the GART
>> over memory areas reserved by the BIOS.  If I were to guess, I would say
>> that the problem here seems to be that the kernel thinks it is
>> overlaying 64 MiB of memory, but the actual GART is in fact 512 MiB in
>> size -- 131072 CPU pages -- which now overlaps the BIOS reserved areas.
>> Alex D., could you comment on the "num cpu pages" bit?
> These are not CPU addresses. I think we've stated that already. Not the
> droids.
> the num cpu pages is how many CPU pages would be needed to fill the GPU
> GTT, for those crazy cases where CPU pagesize != GPU pagesize.

OK, well, something is still weird.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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