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

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Message-ID: <86802c440803211208v40088eb1qe3f03977b220078@mail.gmail.com>
Date:	Fri, 21 Mar 2008 12:08:29 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: early memtest to find bad ram

On Fri, Mar 21, 2008 at 6:08 AM, H. Peter Anvin <hpa@...or.com> 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?

YH
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