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

[Yinghai Lu]

On Fri, Oct 5, 2012 at 2:32 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
> 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.

with bzImage or vmlinux?
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