On 11/11/2013 03:31 PM, H. Peter Anvin wrote:
> On 11/11/2013 03:35 AM, Ingo Molnar wrote:
>
> Oops! I had misunderstood how the checker worked -- I thought it
> checked the *reserved* memory, but it in fact reserves memory
> *independently* and then checks it.
>
And now I understand why I had that misconception:
> Periodically check for memory corruption in low memory, which
> is suspected to be caused by BIOS. Even when enabled in the
> configuration, it is disabled at runtime. Enable it by
> setting "memory_corruption_check=1" on the kernel command
> line. By default it scans the low 64k of memory every 60
> seconds; see the memory_corruption_check_size and
> memory_corruption_check_period parameters in
> Documentation/kernel-parameters.txt to adjust this.
This makes it sound like it scans the low 64K when it is turned on, i.e.
the bit that is reserved by default.
I think we should change that default too to 640K. I will post a
patchset shortly.
-hpa
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