Re: [PATCH 04/13] x86, mm: Revert back good_end setting for 64bit

[Eric W. Biederman]

Yinghai Lu <yinghai@xxxxxxxxxx> writes:

> On Fri, Oct 5, 2012 at 2:04 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>>>> Is there a git commit that explains what the 'big range' problem is?
>>
>> At least on x86_64 this was recently tested and anywhere below 4G is
>> good, and there is a patch floating around somewhere to remove this
>> issue.
>
> patch for kernel or kexec-tools?

kernel.

The sgi guys needed a kdump kernel with 1G of ram to dump their all of
the memory on one of their crazy large machines and so investigated
this.

Basically they found that a kdump kernel loaded anywhere < 4G worked,
the only change that was needed was to relaxy the 896M hard code.

In one test they had a kdump kernel loaded above 2G.

Eric

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