Re: [PATCH] x86_64: early memtest to find bad ram

[H. Peter Anvin]

Yinghai Lu wrote:
> On Fri, Mar 21, 2008 at 6:08 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> > Ingo Molnar wrote:
> >  >
> >  > very nice patch! I always thought that this was the proper way to do
> >  > memtest - and we could in fact also do something like this after SMP
> >  > bringup, and hit the memory bus via multiple CPUs. [that will need a
> >  > different enumeration though than e820 maps]
> >  >
> >  > one structural observation: please make this unified functionality, so
> >  > that 32-bit kernels can make use of it too.
> >  >
> >
> >  Indeed.  Of course, it would also be nice if distros shipped
> >  bootloader-invoked prekernel test software, like memtest86+, by default.
>
> the current memtest86 is running in 32 bit mode, and only support 64G ram.
>
> I tried to expand that a bit, to support 1024g, but it only works on
> some machine.
> could be stack provide is not big enough?

Wonder how hard it would be to make it run 64 bits...

	-hpa
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